[S390] cpu hotplug: fix external interrupt subclass mask handling

When disabling a cpu all external interrupt subclass masks in control
register 0 get cleared. However instead of the service signal subclass
mask bit an unused bit got cleared.
Accidently (or luckily) the service subclass mask gets cleared with the
pfault_fini() call that happens just before the rest of the subclass
mask bits get cleared.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>

arch/s390/kernel/smp.c

@@ -654,8 +654,8 @@ int __cpu_disable(void)
 
 	/* disable all external interrupts */
 	cr_parms.orvals[0] = 0;
-	cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 12 |
-				1 << 11 | 1 << 10 | 1 <<  6 | 1 <<  4);
+	cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 11 |
+				1 << 10 | 1 <<	9 | 1 <<  6 | 1 <<  4);
 	/* disable all I/O interrupts */
 	cr_parms.orvals[6] = 0;
 	cr_parms.andvals[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 |