util: Added noreturn attribute to appropriate functions

clang is a bit more strict on the attribute usage, so let's comply.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>

util/wmsetbg.c

@@ -24,6 +24,8 @@
 /*
  * TODO: rewrite, too dirty
  */
+#include "config.h"
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
@@ -37,8 +39,6 @@
 #include <sys/types.h>
 #include <ctype.h>
 
-#include "../config.h"
-
 #ifdef XINERAMA
 # ifdef SOLARIS_XINERAMA	/* sucks */
 #  include <X11/extensions/xinerama.h>
@@ -47,6 +47,10 @@
 # endif
 #endif
 
+#ifdef HAVE_STDNORETURN
+#include <stdnoreturn.h>
+#endif
+
 #include "../src/wconfig.h"
 
 #ifndef GLOBAL_DEFAULTS_SUBDIR
@@ -880,7 +884,7 @@ static int readmsg(int fd, char *buffer, int size)
  * n is 4 bytes
  * size = 4 bytes for length of the message data
  */
-static void helperLoop(RContext * rc)
+static noreturn void helperLoop(RContext * rc)
 {
 	BackgroundTexture *textures[WORKSPACE_COUNT];
 	int maxTextures = 0;