don't strchr on NULL, second resolution to MODAPP-2

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4393 d0543943-73ff-0310-b7d9-9358b9ac24b2

diff --git a/src/switch_channel.c b/src/switch_channel.c
index d5827f18ffa442a42861d61f0d320020a509a7f2..7e0e7fe88cfef2c4f6237fc6b5379e1d4d1cd5e3 100644 (file)
--- a/src/switch_channel.c
+++ b/src/switch_channel.c
@@ -1202,7 +1202,7 @@ SWITCH_DECLARE(char *) switch_channel_expand_variables(switch_channel_t *channel
        size_t sp = 0, len = 0, olen = 0, vtype = 0, br = 0, cpos, block = 128;
        char *sub_val = NULL, *func_val = NULL;
 
-       if (!strchr(in, '$')) {
+       if (!in || !strchr(in, '$')) {
                return in;
        }