Blackfin arch: after removing fs.h from mm.h, fix the broken on Blackfin arch

Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: NBryan Wu <bryan.wu@analog.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/blackfin/kernel/init_task.c

@@ -31,6 +31,7 @@
 #include <linux/module.h>
 #include <linux/init_task.h>
 #include <linux/mqueue.h>
+#include <linux/fs.h>
 
 static struct fs_struct init_fs = INIT_FS;
 static struct files_struct init_files = INIT_FILES;

arch/blackfin/kernel/process.c

@@ -33,6 +33,8 @@
 #include <linux/user.h>
 #include <linux/a.out.h>
 #include <linux/uaccess.h>
+#include <linux/fs.h>
+#include <linux/err.h>
 
 #include <asm/blackfin.h>
 #include <asm/fixed_code.h>

arch/blackfin/kernel/sys_bfin.c

@@ -37,6 +37,7 @@
 #include <linux/syscalls.h>
 #include <linux/mman.h>
 #include <linux/file.h>
+#include <linux/fs.h>
 #include <linux/uaccess.h>
 #include <linux/ipc.h>
 #include <linux/unistd.h>

arch/blackfin/kernel/traps.c

@@ -31,6 +31,7 @@
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/kallsyms.h>
+#include <linux/fs.h>
 #include <asm/traps.h>
 #include <asm/cacheflush.h>
 #include <asm/blackfin.h>