code: fix memory leak

example/osfp_example.c

@@ -25,6 +25,7 @@
 
 #define VLAN_MAX_LAYER  2
 
+struct osfp_db *g_osfp_db;
 
 /* Port is just a uint16_t */
 typedef uint16_t Port;
@@ -496,6 +497,8 @@ void example_detect(struct osfp_db *osfp_db, Packet *p)
         fflush(stdout);
     }
 
+    free(json);
+
 exit:
     if (result) {
         osfp_result_free(result);
@@ -562,6 +565,8 @@ static void signal_handler(int signum)
 
     fflush(stdout);
 
+    osfp_db_free(g_osfp_db);
+
     exit(0);
 }
 
@@ -690,6 +695,8 @@ int main(int argc, char *argv[])
         exit(1);
     }
 
+    g_osfp_db = osfp_db;
+
     // loop
     while (1) {
         int r = pcap_dispatch(pcap_handle, 0, (pcap_handler)process_packet, (void*)osfp_db);