[IA64] Allow salinfo_decode to detect signals on read

Return -EINTR instead of -ERESTARTSYS when signals are delivered during
a blocked read of /proc/sal/*/event.  This allows salinfo_decode to
detect signals when it is blocked on a read of those files.

Signed-off-by: Keith Owens <kaos@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/salinfo.c

@@ -293,7 +293,7 @@ retry:
 		if (file->f_flags & O_NONBLOCK)
 			return -EAGAIN;
 		if (down_interruptible(&data->sem))
-			return -ERESTARTSYS;
+			return -EINTR;
 	}
 
 	n = data->cpu_check;