fix windows code analysis problems

libs/esl/src/esl.c

@@ -1053,6 +1053,7 @@ static int add_array(esl_event_t *event, const char *var, const char *val)
 	data = strdup(val + 7);
 	
 	len = (sizeof(char *) * max) + 1;
+	esl_assert(len == 0);
 	array = malloc(len);
 	memset(array, 0, len);
 	

libs/esl/src/esl_event.c

@@ -298,7 +298,7 @@ ESL_DECLARE(esl_status_t) esl_event_del_header_val(esl_event_t *event, const cha
 		esl_assert(x < 1000000);
 		hash = esl_ci_hashfunc_default(header_name, &hlen);
 
-		if ((!hp->hash || hash == hp->hash) && !strcasecmp(header_name, hp->name) && (esl_strlen_zero(val) || !strcmp(hp->value, val))) {
+		if ((!hp->hash || hash == hp->hash) && (hp->name && !strcasecmp(header_name, hp->name)) && (esl_strlen_zero(val) || !strcmp(hp->value, val))) {
 			if (lp) {
 				lp->next = hp->next;
 			} else {
@@ -625,6 +625,8 @@ ESL_DECLARE(esl_status_t) esl_event_serialize(esl_event_t *event, char **str, es
 
 	dlen = blocksize * 2;
 
+	esl_assert(dlen == 0);
+
 	if (!(buf = malloc(dlen))) {
 		abort();
 	}

src/include/switch_event.h

@@ -152,7 +152,7 @@ SWITCH_DECLARE(switch_status_t) switch_event_set_priority(switch_event_t *event,
   \return the value of the requested header
 */
 
-_Ret_opt_z_ SWITCH_DECLARE(switch_event_header_t *) switch_event_get_header_ptr(switch_event_t *event, const char *header_name);
+SWITCH_DECLARE(switch_event_header_t *) switch_event_get_header_ptr(switch_event_t *event, const char *header_name);
 _Ret_opt_z_ SWITCH_DECLARE(char *) switch_event_get_header_idx(switch_event_t *event, const char *header_name, int idx);
 #define switch_event_get_header(_e, _h) switch_event_get_header_idx(_e, _h, -1)