f2fs: mark recovery flag correctly in read_raw_super_block()

On the combination of first fail and second success,
we will miss to mark recovery flag because currently
we reuse err variable in the loop.
Signed-off-by: NChengguang Xu <cgxu519@zoho.com.cn>
Reviewed-by: NChao Yu <yuchao0@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/super.c

@@ -2951,6 +2951,7 @@ static int read_raw_super_block(struct f2fs_sb_info *sbi,
 			f2fs_err(sbi, "Unable to read %dth superblock",
 				 block + 1);
 			err = -EIO;
+			*recovery = 1;
 			continue;
 		}
 
@@ -2960,6 +2961,7 @@ static int read_raw_super_block(struct f2fs_sb_info *sbi,
 			f2fs_err(sbi, "Can't find valid F2FS filesystem in %dth superblock",
 				 block + 1);
 			brelse(bh);
+			*recovery = 1;
 			continue;
 		}
 
@@ -2972,10 +2974,6 @@ static int read_raw_super_block(struct f2fs_sb_info *sbi,
 		brelse(bh);
 	}
 
-	/* Fail to read any one of the superblocks*/
-	if (err < 0)
-		*recovery = 1;
-
 	/* No valid superblock */
 	if (!*raw_super)
 		kvfree(super);