* process.c (handle_child_signal): Fix crash; deleted pid.

This was introduced by my 2013-08-12 fix for Bug#15035.

Fixes: debbugs:15106

src/ChangeLog

+2013-08-19  Paul Eggert  <eggert@cs.ucla.edu>
+
+	* process.c (handle_child_signal): Fix crash; deleted pid (Bug#15106).
+	This was introduced by my 2013-08-12 fix for Bug#15035.
+
 2013-08-19  Dmitry Antipov  <dmantipov@yandex.ru>
 
 	* image.c (imagemagick_create_cache, imagemagick_get_animation_cache)

src/process.c

@@ -6153,7 +6153,10 @@ handle_child_signal (int sig)
 	= (MOST_NEGATIVE_FIXNUM <= TYPE_MINIMUM (pid_t)
 	   && TYPE_MAXIMUM (pid_t) <= MOST_POSITIVE_FIXNUM);
       Lisp_Object head = XCAR (tail);
-      Lisp_Object xpid = XCAR (head);
+      Lisp_Object xpid;
+      if (! CONSP (head))
+	continue;
+      xpid = XCAR (head);
       if (all_pids_are_fixnums ? INTEGERP (xpid) : NUMBERP (xpid))
 	{
 	  pid_t deleted_pid;