f2fs: fix wrong error injection path in inc_valid_block_count()

If FAULT_BLOCK type error injection is on, in inc_valid_block_count()
we may decrease sbi->alloc_valid_block_count percpu stat count
incorrectly, fix it.

Fixes: 36b877af ("f2fs: Keep alloc_valid_block_count in sync")
Signed-off-by: NChao Yu <yuchao0@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/f2fs.h

@@ -1771,7 +1771,7 @@ static inline int inc_valid_block_count(struct f2fs_sb_info *sbi,
 	if (time_to_inject(sbi, FAULT_BLOCK)) {
 		f2fs_show_injection_info(FAULT_BLOCK);
 		release = *count;
-		goto enospc;
+		goto release_quota;
 	}
 
 	/*
@@ -1816,6 +1816,7 @@ static inline int inc_valid_block_count(struct f2fs_sb_info *sbi,
 
 enospc:
 	percpu_counter_sub(&sbi->alloc_valid_block_count, release);
+release_quota:
 	dquot_release_reservation_block(inode, release);
 	return -ENOSPC;
 }