[S390] stack dump: fix indentation in output

The first line of a stack dump has a wrong (no) indentation.
Just fix this after more than 10 years.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 8894ac4..cd6ebe1 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -145,8 +145,8 @@
 	for (i = 0; i < kstack_depth_to_print; i++) {
 		if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
 			break;
-		if (i && ((i * sizeof (long) % 32) == 0))
-			printk("\n       ");
+		if ((i * sizeof(long) % 32) == 0)
+			printk("%s       ", i == 0 ? "" : "\n");
 		printk(LONG, *stack++);
 	}
 	printk("\n");