ARM: 8658/1: uaccess: fix zeroing of 64-bit get_user()

The 64-bit get_user() wasn't clearing the high word due to a typo in the
error handler. The exception handler entry was already correct, though.
Noticed during recent usercopy test additions in lib/test_user_copy.c.
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

arch/arm/lib/getuser.S

@@ -67,7 +67,7 @@ ENTRY(__get_user_4)
 ENDPROC(__get_user_4)
 
 ENTRY(__get_user_8)
-	check_uaccess r0, 8, r1, r2, __get_user_bad
+	check_uaccess r0, 8, r1, r2, __get_user_bad8
 #ifdef CONFIG_THUMB2_KERNEL
 5: TUSER(ldr)	r2, [r0]
 6: TUSER(ldr)	r3, [r0, #4]