powerpc/xmon: Fix compile error in print_insn* functions

Fix couple of compile errors I stumbled upon with CONFIG_XMON=y and
CONFIG_XMON_DISASSEMBLY=n
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200123010455.GA15080@us.ibm.com

arch/powerpc/xmon/dis-asm.h

@@ -13,13 +13,13 @@ extern int print_insn_spu(unsigned long insn, unsigned long memaddr);
 #else
 static inline int print_insn_powerpc(unsigned long insn, unsigned long memaddr)
 {
-	printf("%.8x", insn);
+	printf("%.8lx", insn);
 	return 0;
 }
 
 static inline int print_insn_spu(unsigned long insn, unsigned long memaddr)
 {
-	printf("%.8x", insn);
+	printf("%.8lx", insn);
 	return 0;
 }
 #endif