afs: Fix an IS_ERR() vs NULL check
[ Upstream commit a33d6266 ] The proc_symlink() function returns NULL on error, it doesn't return error pointers. Fixes: 5b86d4ff ("afs: Implement network namespacing") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: David Howells <dhowells@redhat.com> cc: linux-afs@lists.infradead.org Link: https://lore.kernel.org/r/YLjMRKX40pTrJvgf@mwanda/ Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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