applied Jukka's sigchld patch

LICENSE

@@ -2,7 +2,7 @@ MIT/X Consortium License
 
 © 2006-2009 Anselm R Garbe <garbeam at gmail dot com>
 © 2006-2007 Sander van Dijk <a dot h dot vandijk at gmail dot com>
-© 2006-2007 Jukka Salmi <jukka at salmi dot ch>
+© 2006-2009 Jukka Salmi <jukka at salmi dot ch>
 © 2007-2009 Premysl Hruby <dfenze at gmail dot com>
 © 2007-2009 Szabolcs Nagy <nszabolcs at gmail dot com>
 © 2007-2009 Christof Musik <christof at sendfax dot de>

dwm.c

@@ -1429,7 +1429,6 @@ setup(void) {
 	XSetWindowAttributes wa;
 
 	/* clean up any zombies immediately */
-	signal(SIGCHLD, sigchld);
 	sigchld(0);
 
 	/* init screen */
@@ -1501,8 +1500,9 @@ showhide(Client *c) {
 
 void
 sigchld(int unused) {
+	if(signal(SIGCHLD, sigchld) == SIG_ERR)
+		die("Can't install SIGCHLD handler");
 	while(0 < waitpid(-1, NULL, WNOHANG));
-	signal(SIGCHLD, sigchld);
 }
 
 void