btrfs: Free fully occupied bitmap in cluster
btrfs: Free fully occupied bitmap in cluster

If there's no more free space in a bitmap, we should free it.

Reviewed-by: Josef Bacik <78b342861d821967b29f951b7366f5a0267e0c38@redhat.com>
Signed-off-by: Li Zefan <5dc16b054e85ffba6c8d314d8e55ae95dcab12a5@cn.fujitsu.com>

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