microblaze: Fix sparse warning - fault.c

Warning log:
CHECK   arch/microblaze/mm/fault.c
arch/microblaze/mm/fault.c:51:6: warning: incorrect type in initializer (different address spaces)
arch/microblaze/mm/fault.c:51:6:    expected unknown type 2const [noderef] *__gu_addr<asn:1>
arch/microblaze/mm/fault.c:51:6:    got unsigned int *<noident>
arch/microblaze/mm/fault.c:68:6: warning: symbol 'bad_page_fault' was not declared. Should it be static?
Signed-off-by: Michal Simek <monstr@monstr.eu>

arch/microblaze/include/asm/exceptions.h

@@ -67,6 +67,7 @@ asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
 							int fsr, int addr);
 
 asmlinkage void sw_exception(struct pt_regs *regs);
+void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig);
 
 void die(const char *str, struct pt_regs *fp, long err);
 void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr);

arch/microblaze/mm/fault.c

@@ -48,7 +48,7 @@ static int store_updates_sp(struct pt_regs *regs)
 {
 	unsigned int inst;
 
-	if (get_user(inst, (unsigned int *)regs->pc))
+	if (get_user(inst, (unsigned int __user *)regs->pc))
 		return 0;
 	/* check for 1 in the rD field */
 	if (((inst >> 21) & 0x1f) != 1)