fix an error message in checkstack()

The order of some printk arguments were reversed.

Change-Id: I5e8f70b79050b92ebe8cfa5aae94b6cd1a5fd547
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/2364
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/lib/stack.c

@@ -31,7 +31,7 @@ int checkstack(void *top_of_stack, int core)
 	if (stack[0] != 0xDEADBEEF){
 		printk(BIOS_ERR, "Stack overrun on CPU%d."
 			"Increase stack from current %d bytes\n",
-			CONFIG_STACK_SIZE, core);
+			core, CONFIG_STACK_SIZE);
 		return -1;
 	}