md: bcache: io.c: fix a potential NULL pointer dereference
md: bcache: io.c: fix a potential NULL pointer dereference

commit 5c694129c8db6d89c9be109049a16510b2f70f6d upstream.

bio_alloc_bioset returns NULL on failure. This fix adds a missing check
for potential NULL pointer dereferencing.

Signed-off-by: Kumar Amit Mehta <e038b94d25b48ccb2c6ad460398c5350e8279f4c@gmail.com>
Signed-off-by: Kent Overstreet <8f464ad20d7f95b5ede78c4772dc4f5cc3ffa553@google.com>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>


TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas