posix: Fix default posix_spawn return value
This patch fix the return value for error conditions for default posix_spawn (where the errno is expected). It also avoid clobber errno on fork call. Checked on x86_64 (with Linux implementation removed). [BZ# 21697] * sysdeps/posix/spawni.c (__spawni_child): Fix return value. (__spawnix): Do not clober errno.
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