made error handling more proper

dwm.c

@@ -1302,8 +1302,13 @@ run(void) {
 		if(FD_ISSET(STDIN_FILENO, &rd)) {
 			if(stext == fgets(stext, sizeof stext - 1, stdin))
 				stext[strlen(stext) - 1] = '\0'; /* remove tailing '\n' */
-			else
+			else {
+				readin = False;
+				if(feof(stdin))
+					strncpy(stext, "EOF", 4);
+				else /* error occured */
 					strncpy(stext, strerror(errno), sizeof stext - 1);
+			}
 			drawbar();
 		}
 		while(XPending(dpy)) {