bcache: Style/checkpatch fixes

Took out some nested functions, and fixed some more checkpatch
complaints.

Signed-off-by: Kent Overstreet <koverstreet@google.com>
Cc: linux-bcache@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --cc drivers/md/bcache/alloc.c
Simple merge

diff --cc drivers/md/bcache/bcache.h
Simple merge

diff --cc drivers/md/bcache/bset.c
Simple merge

diff --cc drivers/md/bcache/btree.c
Simple merge

diff --cc drivers/md/bcache/debug.c
Simple merge

diff --cc drivers/md/bcache/journal.c
Simple merge

diff --cc drivers/md/bcache/movinggc.c
Simple merge

diff --cc drivers/md/bcache/request.c
Simple merge

diff --cc drivers/md/bcache/stats.c
Simple merge

diff --cc drivers/md/bcache/super.c
Simple merge