10f0695
author Theodore Ts'o <tytso@mit.edu> 1280246168 -0400
committer Theodore Ts'o <tytso@mit.edu> 1280246168 -0400

ext4: check to make make sure bd_dev is set before dereferencing it

There are some drivers which may not set bdev->bd_dev.  So make sure
it is non-NULL before dereferencing it.

Google-Bug-Id: 1773557

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>