update

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3458 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_channel.c

@@ -1196,8 +1196,7 @@ SWITCH_DECLARE(char *) switch_channel_expand_variables(switch_channel_t *channel
 						return in;
 					}
 				}
-				nlen = sub_val ? strlen(sub_val) : 0;
-
+				if ((nlen = sub_val ? strlen(sub_val) : 0)) {
 					if (len + nlen >= olen) {
 						olen = (olen + len + nlen + block);
 						cpos = c - data;
@@ -1205,10 +1204,11 @@ SWITCH_DECLARE(char *) switch_channel_expand_variables(switch_channel_t *channel
 						c = data + cpos;
 						memset(c, 0, olen - cpos);
 					}
-				if (nlen) {
+
 					len += nlen;
 					strcat(c, sub_val);
 					c += nlen;
+
 				}
 				
 				switch_safe_free(func_val);