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If affs_bread() fails, the exit path calls mark_buffer_dirty_inode() with a
NULL argument.

Coverity CID: 312.
Signed-off-by: Florin Malita <fmalita@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>