ia64: annotate a switch fallthrough in ia64_do_signal

Also reindent the switch statement to use the normal kernel style
while at it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lkml.kernel.org/r/20190812065524.19959-2-hch@lst.deSigned-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/signal.c

@@ -363,19 +363,19 @@ ia64_do_signal (struct sigscratch *scr, long in_syscall)
 
 		if (unlikely(restart)) {
 			switch (errno) {
-			      case ERESTART_RESTARTBLOCK:
-			      case ERESTARTNOHAND:
+			case ERESTART_RESTARTBLOCK:
+			case ERESTARTNOHAND:
 				scr->pt.r8 = EINTR;
 				/* note: scr->pt.r10 is already -1 */
 				break;
-
-			      case ERESTARTSYS:
+			case ERESTARTSYS:
 				if ((ksig.ka.sa.sa_flags & SA_RESTART) == 0) {
 					scr->pt.r8 = EINTR;
 					/* note: scr->pt.r10 is already -1 */
 					break;
 				}
-			      case ERESTARTNOINTR:
+				/*FALLTHRU*/
+			case ERESTARTNOINTR:
 				ia64_decrement_ip(&scr->pt);
 				restart = 0; /* don't restart twice if handle_signal() fails... */
 			}