Remove redundant condition in nghttp3_conn_submit_request() #931

Job	Run time
build-cross (x86_64-w64-mingw32)	1m 10s
build-cross (i686-w64-mingw32)	2m 53s
build-windows (x86)	1m 3s
build (ubuntu-24.04, gcc, autotools)	51s
build-windows (x64)	1m 14s
build (ubuntu-24.04, gcc, cmake)	48s
build (ubuntu-24.04, clang, autotools)	50s
build (ubuntu-24.04, clang, distcheck)	59s
build (ubuntu-24.04, clang, cmake)	47s
build (macos-13, gcc, autotools)	1m 25s
build (macos-13, gcc, cmake)	1m 19s
build (macos-13, clang, autotools)	1m 9s
build (macos-13, clang, cmake)	1m 53s
build (macos-14, gcc, autotools)	41s
build (macos-14, gcc, cmake)	44s
build (macos-14, clang, autotools)	49s
build (macos-14, clang, cmake)	43s
release	0s
	19m 18s

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