Adhemerval Zanella db6b2f2522 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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