child: add extra args in correct order #7727
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Previously, the arguments where added in backwards order. Insted:
-A -B -C value
it appenedvalue -C -B -A
, which caused issues withvalue arguments.
This commit refactors the code to add all arguments in natural order
starting from argv[0]..argv[argc] instead of attempting to create argv
from the end argv[argc]..argv[0] which can easily create confusion.
Also switched to talloc_zero_array() to handle NULL more intuitively.