FROMLIST: cachefiles: Handle readpage error correctly

If ->readpage returns an error, it has already unlocked the page.

Bug: 171770067
Link: https://lore.kernel.org/r/20201027080745.GA31045@infradead.org


Fixes: 5e929b33 ("CacheFiles: Handle truncate unlocking the page we're reading")
Cc: stable@vger.kernel.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I18814ade2a1b989bda4b732bf6bacecf4ad1b9a3