replaced a ton of free or strdup calls for zap_safe_free and zap_strdup

git-svn-id: http://svn.openzap.org/svn/openzap/branches/sangoma_boost@864 a93c3328-9c30-0410-af19-c9cd2b2d52af

libs/freetdm/src/include/openzap.h

@@ -625,6 +625,9 @@ OZ_DECLARE(zap_status_t) zap_queue_wait(zap_queue_t *queue, int ms);
 /*! destroy the queue */ 
 OZ_DECLARE(zap_status_t) zap_queue_destroy(zap_queue_t **queue);
 
+/* Duplicate string */
+OZ_DECLARE(char *) zap_strdup(const char *str);
+
 OZ_DECLARE(zap_size_t) zap_fsk_modulator_generate_bit(zap_fsk_modulator_t *fsk_trans, int8_t bit, int16_t *buf, zap_size_t buflen);
 OZ_DECLARE(int32_t) zap_fsk_modulator_generate_carrier_bits(zap_fsk_modulator_t *fsk_trans, uint32_t bits);
 OZ_DECLARE(void) zap_fsk_modulator_generate_chan_sieze(zap_fsk_modulator_t *fsk_trans);