ext4: convert ext4_dx_find_entry() to use the ERR_PTR convention
ext4: convert ext4_dx_find_entry() to use the ERR_PTR convention

Signed-off-by: Theodore Ts'o <4ed386e0495d3e109932df055831d9ec2f824927@mit.edu>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs