ext4: use sb_issue_zeroout in ext4_ext_zeroout
ext4: use sb_issue_zeroout in ext4_ext_zeroout

Change ext4_ext_zeroout to use sb_issue_zeroout instead of its
own approach to zero out extents.

Signed-off-by: Lukas Czerner <6c9141d0e2318b390a8a6bf8ecd9f819d16f05b4@redhat.com>
Signed-off-by: "Theodore Ts'o" <4ed386e0495d3e109932df055831d9ec2f824927@mit.edu>

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