K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2010-04-20T10:16:44.478762Z
K 7
svn:log
V 365
Slightly modernize realpath(3).

SUSv4 requires that implementation returns EINVAL if supplied path is NULL,
and ENOENT if path is empty string [1].
Bring prototype in conformance with SUSv4, adding restrict keywords.
Allow the resolved path buffer pointer be NULL, in which case realpath(3)
allocates storage with malloc().

PR:	kern/121897 [1]
MFC after:	2 weeks

END