fs: fix missing declaration of init_files

fs/file.c should include include/linux/init_task.h  for
 declaration of init_files. This fixes the sparse warning:

fs/file.c:501:21: warning: symbol 'init_files' was not declared. Should it be static?

Signed-off-by: Zhang Kunbo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christian Brauner <[email protected]>

Author: Zhang Kunbo

fs/file.c

@@ -22,6 +22,7 @@
 #include <linux/close_range.h>
 #include <linux/file_ref.h>
 #include <net/sock.h>
+#include <linux/init_task.h>
 
 #include "internal.h"