f2fs: inject fault in inc_valid_node_count

This patch adds missing fault injection in inc_valid_node_count.
Signed-off-by: NChao Yu <yuchao0@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/f2fs.h

@@ -1770,6 +1770,13 @@ static inline int inc_valid_node_count(struct f2fs_sb_info *sbi,
 			return ret;
 	}
 
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+	if (time_to_inject(sbi, FAULT_BLOCK)) {
+		f2fs_show_injection_info(FAULT_BLOCK);
+		goto enospc;
+	}
+#endif
+
 	spin_lock(&sbi->stat_lock);
 
 	valid_block_count = sbi->total_valid_block_count + 1;