let path_init() failures treated the same way as subsequent link_path_walk()
let path_init() failures treated the same way as subsequent link_path_walk()

As it is, path_lookupat() and path_mounpoint() might end up leaking struct file
reference in some cases.

Spotted-by: Eric Biggers <2c473c19cb2299560280a7d1cf4bf711b19eb7c0@gmail.com>
Signed-off-by: Al Viro <de609eb4d5d70b1d38ec6642adbfc33a2781f63c@zeniv.linux.org.uk>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs