Btrfs: clean up for find_first_extent_bit()
Btrfs: clean up for find_first_extent_bit()

find_first_extent_bit() and find_first_extent_bit_state() share
most of the code, and we can just make the former call the latter.

Signed-off-by: Xiao Guangrong <1e0036c3819c78880ef9e9a8457e99783a5661e3@cn.fujitsu.com>
Signed-off-by: Li Zefan <5dc16b054e85ffba6c8d314d8e55ae95dcab12a5@cn.fujitsu.com>
Signed-off-by: Chris Mason <a169954b4cb1a46cee25f659d3bddfebe02b5fba@oracle.com>

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