[PATCH v2] sh: implicit access_ok() needs an #include

[Randy Dunlap <rdunlap@infradead.org>]

Building arch/sh/ has a build error/warning that is fixed by
adding an #include of a header file.

../arch/sh/include/asm/checksum_32.h: In function 'csum_and_copy_from_user':
../arch/sh/include/asm/checksum_32.h:53:14: error: implicit declaration of function 'access_ok' [-Werror=implicit-function-declaration]
   53 |         if (!access_ok(src, len))
      |              ^~~~~~~~~

Fixes: 7fe8970a78a1 ("sh32: convert to csum_and_copy_from_user()")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: linux-sh@vger.kernel.org
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
---
v2: add Subject: and patch description

 arch/sh/include/asm/checksum_32.h |    1 +
 1 file changed, 1 insertion(+)

diff -- a/arch/sh/include/asm/checksum_32.h b/arch/sh/include/asm/checksum_32.h
--- a/arch/sh/include/asm/checksum_32.h
+++ b/arch/sh/include/asm/checksum_32.h
@@ -7,6 +7,7 @@
  */
 
 #include <linux/in6.h>
+#include <asm-generic/access_ok.h>
 
 /*
  * computes the checksum of a memory block at buff, length len,