ext[234]: cleanup ext[234]_bg_num_gdb()

Use ext[234]_bg_has_super() to remove duplicate code.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
index f86207b..e7b2baf 100644
--- a/fs/ext2/balloc.c
+++ b/fs/ext2/balloc.c
@@ -1533,9 +1533,6 @@
  */
 unsigned long ext2_bg_num_gdb(struct super_block *sb, int group)
 {
-	if (EXT2_HAS_RO_COMPAT_FEATURE(sb,EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)&&
-	    !ext2_group_sparse(group))
-		return 0;
-	return EXT2_SB(sb)->s_gdb_count;
+	return ext2_bg_has_super(sb, group) ? EXT2_SB(sb)->s_gdb_count : 0;
 }