bcache: Fix a minor memory leak on device teardown
bcache: Fix a minor memory leak on device teardown

Reported-by: Mike Snitzer <85e533f2e78486213c4d69f71462342ec0c62734@redhat.com>
Signed-off-by: Kent Overstreet <8f464ad20d7f95b5ede78c4772dc4f5cc3ffa553@google.com>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas