uml: eliminate SIGALRM

Now that ITIMER_REAL is no longer used, there is no need for any use of
SIGALRM whatsoever.  This patch removes all mention of it.

In addition, real_alarm_handler took a signal argument which is now always
SIGVTALRM.  So, that is gone.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/um/os-Linux/main.c b/arch/um/os-Linux/main.c
index 1518f7a..82c3778 100644
--- a/arch/um/os-Linux/main.c
+++ b/arch/um/os-Linux/main.c
@@ -161,7 +161,7 @@
 	 * some time) and cause a segfault.
 	 */
 
-	/* stop timers and set SIG*ALRM to be ignored */
+	/* stop timers and set SIGVTALRM to be ignored */
 	disable_timer();
 
 	/* disable SIGIO for the fds and set SIGIO to be ignored */