f2fs: clean up unused variables and return values

This patch cleans up a couple of unnecessary codes related to unused variables
and return values.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
diff --git a/fs/f2fs/hash.c b/fs/f2fs/hash.c
index 5e48bac..6977415 100644
--- a/fs/f2fs/hash.c
+++ b/fs/f2fs/hash.c
@@ -71,7 +71,7 @@
 
 f2fs_hash_t f2fs_dentry_hash(const char *name, int len)
 {
-	__u32 hash, minor_hash;
+	__u32 hash;
 	f2fs_hash_t f2fs_hash;
 	const char *p;
 	__u32 in[8], buf[4];
@@ -94,8 +94,6 @@
 		p += 16;
 	}
 	hash = buf[0];
-	minor_hash = buf[1];
-
 	f2fs_hash = cpu_to_le32(hash & ~F2FS_HASH_COL_BIT);
 	return f2fs_hash;
 }