Merged revisions 232269 via svnmerge from

https://origsvn.digium.com/svn/asterisk/trunk

................
  r232269 | dvossel | 2009-12-02 09:42:54 -0600 (Wed, 02 Dec 2009) | 15 lines
  
  Merged revisions 232268 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.4
  
  ........
    r232268 | dvossel | 2009-12-02 09:41:36 -0600 (Wed, 02 Dec 2009) | 9 lines
    
    fixes segfault in func_groupcount
    
    closes issue #16337)
    Reported by: Parantido
    Patches:
          issue_16337.diff uploaded by dvossel (license 671)
    	  Tested by: Parantido, dvossel
  ........
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@232270 65c4cc65-6c06-0410-ace0-fbb531ad65f3

funcs/func_groupcount.c

@@ -194,6 +194,10 @@ static int group_function_write(struct ast_channel *chan, const char *cmd,
 {
 	char grpcat[256];
 
+	if (!value) {
+		return -1;
+	}
+
 	if (!ast_strlen_zero(data)) {
 		snprintf(grpcat, sizeof(grpcat), "%s@%s", value, data);
 	} else {