ext4: use string choices helpers

Use string choice helpers for better readability and to fix cocci warning

Reported-by: kernel test robot <[email protected]>
Reported-by: Julia Lawall <[email protected]>
Closes: https://lore.kernel.org/r/[email protected]/
Signed-off-by: R Sundar <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Theodore Ts'o <[email protected]>

Author: prosun786

fs/ext4/mballoc.c

@@ -6056,7 +6056,7 @@ static bool ext4_mb_discard_preallocations_should_retry(struct super_block *sb,
 	}
 
 out_dbg:
-	mb_debug(sb, "freed %d, retry ? %s\n", freed, ret ? "yes" : "no");
+	mb_debug(sb, "freed %d, retry ? %s\n", freed, str_yes_no(ret));
 	return ret;
 }