s390/dumpstack: print psw mask and address again

With pointer obfuscation the output of show_registers() became quite useless:

Krnl PSW : (____ptrval____) (____ptrval____) (__list_add_valid+0x98/0xa8)

In order to print the psw mask and address use %px instead of %p.
And the output looks again like this:

Krnl PSW : 0404d00180000000 00000000007c0dd0 (__list_add_valid+0x98/0xa8)
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/dumpstack.c

@@ -124,7 +124,7 @@ void show_registers(struct pt_regs *regs)
 	char *mode;
 
 	mode = user_mode(regs) ? "User" : "Krnl";
-	printk("%s PSW : %p %p", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);
+	printk("%s PSW : %px %px", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);
 	if (!user_mode(regs))
 		pr_cont(" (%pSR)", (void *)regs->psw.addr);
 	pr_cont("\n");