internal.c var initialization for Espressif Component Manager

[gojimmypi]

Required for #588, this PR addresses some minor issues where the Espressif compiler using cmake complained as shown below.

See the wolfSSH preview component: https://components-staging.espressif.com/components/gojimmypi/mywolfssh

Test drive the template example:

# Setup ESP-IDF
export WRK_IDF_PATH=/mnt/c/SysGCC/esp32/esp-idf/v5.1
echo "Run export.sh from ${WRK_IDF_PATH}"
. ${WRK_IDF_PATH}/export.sh

# fetch and build the example
idf.py create-project-from-example "gojimmypi/mywolfssh^1.0.5-test:wolfssh_template"
cd wolfssh_template
idf.py build

If these errors are observed, the wolfssluser_settings.h needs to be adjusted by adding #define WOLFSSH_TERM:

C:/test/mqtest/6/wolfssh_template/managed_components/gojimmypi__mywolfssh/src/ssh.c:1344:8: error: 'WOLFSSH' has no member named 'termResizeCb'
 1344 |     ssh->termResizeCb = cb;
      |        ^~
C:/test/mqtest/6/wolfssh_template/managed_components/gojimmypi__mywolfssh/src/ssh.c: In function 'wolfSSH_SetTerminalResizeCtx':
C:/test/mqtest/6/wolfssh_template/managed_components/gojimmypi__mywolfssh/src/ssh.c:1350:8: error: 'WOLFSSH' has no member named 'termCtx'
 1350 |     ssh->termCtx = usrCtx;
      |        ^~

Errors observed prior to and addressed in this PR:

C:/test/mqtest/5/wolfssh_template/managed_components/gojimmypi__mywolfssh/src/internal.c: In function 'IdentifyKey':
C:/test/mqtest/5/wolfssh_template/managed_components/gojimmypi__mywolfssh/src/internal.c:875:9: warning: unused variable 'dynType' [-Wunused-variable]
  875 |     int dynType = isPrivate ? DYNTYPE_PRIVKEY : DYNTYPE_PUBKEY;
      |         ^~~~~~~
C:/test/mqtest/5/wolfssh_template/managed_components/gojimmypi__mywolfssh/src/internal.c: In function 'SendKexInit':
C:/test/mqtest/5/wolfssh_template/managed_components/gojimmypi__mywolfssh/src/internal.c:8399:15: error: 'algoCount' may be used uninitialized [-Werror=maybe-uninitialized]
 8399 |         ret = BuildNameList(keyAlgoNames, keyAlgoNamesSz, algo, algoCount);
      |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:/test/mqtest/5/wolfssh_template/managed_components/gojimmypi__mywolfssh/src/internal.c:8327:12: note: 'algoCount' was declared here
 8327 |     word32 algoCount, idx = 0, payloadSz = 0,
      |            ^~~~~~~~~
C:/test/mqtest/5/wolfssh_template/managed_components/gojimmypi__mywolfssh/src/internal.c:8399:15: error: 'algo' may be used uninitialized [-Werror=maybe-uninitialized]
 8399 |         ret = BuildNameList(keyAlgoNames, keyAlgoNamesSz, algo, algoCount);
      |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:/test/mqtest/5/wolfssh_template/managed_components/gojimmypi__mywolfssh/src/internal.c:8326:17: note: 'algo' was declared here
 8326 |     const byte* algo;
      |                 ^~~~
C:/test/mqtest/5/wolfssh_template/managed_components/gojimmypi__mywolfssh/src/internal.c: In function 'SendKexDhReply':
C:/test/mqtest/5/wolfssh_template/managed_components/gojimmypi__mywolfssh/src/internal.c:9751:25: error: 'output' may be used uninitialized [-Werror=maybe-uninitialized]
 9751 |         if (fPad) output[idx++] = 0;
      |                         ^
C:/test/mqtest/5/wolfssh_template/managed_components/gojimmypi__mywolfssh/src/internal.c:9054:11: note: 'output' was declared here
 9054 |     byte* output;
      |           ^~~~~~
C:/test/mqtest/5/wolfssh_template/managed_components/gojimmypi__mywolfssh/src/internal.c:9751:29: error: 'idx' may be used uninitialized [-Werror=maybe-uninitialized]
 9751 |         if (fPad) output[idx++] = 0;
      |                          ~~~^~
C:/test/mqtest/5/wolfssh_template/managed_components/gojimmypi__mywolfssh/src/internal.c:9055:12: note: 'idx' was declared here
 9055 |     word32 idx;
      |            ^~~
cc1.exe: some warnings being treated as errors
[1000/1008] Building C object esp-idf/gojimmypi__mywolfssl...s/__idf_gojimmypi__mywolfssl.dir/wolfcrypt/test/test.c.objninja: build stopped: subcommand failed.
ninja failed with exit code 1, output of the command is in the C:\test\mqtest\5\wolfssh_template\build\log\idf_py_stderr_output_89800 and C:\test\mqtest\5\wolfssh_template\build\log\idf_py_stdout_output_89800

See wolfSSL/wolfssl#6234 for a roadmap of all Espressif improvements currently in progress.