[PATCH] Ensure sys_getwd() doesn't leak memory on error and returns correct error code on older systems.

[Jeremy Allison]

Fix for a memory leak problem on error on non-Linux systems
(that use the old-style getwd()-needs-malloc call). Also
ensures we always return correct errno from getwd() if it
fails.

Please review and push if OK !

Cheers,

	Jeremy.
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