ext2: Delete an unnecessary check before brelse()

The brelse() function tests whether its argument is NULL
and then returns immediately.
Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.
Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net>
Link: https://lore.kernel.org/r/51dea296-2207-ebc0-bac3-13f3e5c3b235@web.deSigned-off-by: NJan Kara <jack@suse.cz>

fs/ext2/super.c

@@ -162,8 +162,7 @@ static void ext2_put_super (struct super_block * sb)
 	}
 	db_count = sbi->s_gdb_count;
 	for (i = 0; i < db_count; i++)
-		if (sbi->s_group_desc[i])
-			brelse (sbi->s_group_desc[i]);
+		brelse(sbi->s_group_desc[i]);
 	kfree(sbi->s_group_desc);
 	kfree(sbi->s_debts);
 	percpu_counter_destroy(&sbi->s_freeblocks_counter);