[core] Coverity fixes

* [core] Coverity 1518099, 1518097, 1518098 (Unchecked return value from library)

* [core] Coverity 1468551 Unchecked return value

* [core] Coverity 1468293 Unchecked return value

* [core] Coverity 1468274 Explicit null dereferenced

* [core] Coverity 1395588 Unchecked return value

* [core] Coverity 1395515 Logically dead code

* [core] Coverity 1364984 Result is not floating-point

* [core] Coverity 1395554, 1468440 Dereference before null check

* [core] Coverity 1024487 Dereference after null check

* [core] Coverity 1024872 Unchecked return value

* [core] Coverity 1025822 Unchecked return value

* [core] Coverity 1025823 Unchecked return value

* [core] Coverity 1087637, 1346467, 1087638 Unchecked return value

* [core] Coverity 1107607 Unchecked return value

* [core] Coverity 1210777 Unchecked return value

* [core] Coverity 1227670 Dereference before null check

* [core] Coverity 1024551 Logically dead code

* [core] Coverity 1024560 Logically dead code

* [core] Coverity 1024664 Operands don't affect result

* [core] Coverity 1364957 Dereference after null check

* [core] Coverity 1395572 Logically dead code

* [core] Coverity 1412459 Unchecked return value

* [core] Coverity 1412490 Unchecked return value

* [core] Coverity 1395515/2 Logically dead code

* [core] Coverity cleanup

src/switch_xml.c

@@ -1726,6 +1726,7 @@ SWITCH_DECLARE(switch_xml_t) switch_xml_parse_file(const char *file)
 		if ( rename(new_file_tmp,new_file) ) {
 			goto done;
 		}
+
 		if ((fd = open(new_file, O_RDONLY, 0)) > -1) {
 			if ((xml = switch_xml_parse_fd(fd))) {
 				if (strcmp(abs, SWITCH_GLOBAL_filenames.conf_name)) {
@@ -1733,8 +1734,8 @@ SWITCH_DECLARE(switch_xml_t) switch_xml_parse_file(const char *file)
 					new_file = NULL;
 				}
 			}
+
 			close(fd);
-			fd = -1;
 		}
 	}
 
@@ -1747,10 +1748,6 @@ SWITCH_DECLARE(switch_xml_t) switch_xml_parse_file(const char *file)
 		write_fd = NULL;
 	}
 
-	if (fd > -1) {
-		close(fd);
-	}
-
 	switch_safe_free(new_file_tmp);
 	switch_safe_free(new_file);
 
@@ -2272,7 +2269,7 @@ SWITCH_DECLARE(switch_status_t) switch_xml_locate_user(const char *key,
 		switch_event_destroy(&my_params);
 	}
 
-	if (status != SWITCH_STATUS_SUCCESS && root && *root) {
+	if (status != SWITCH_STATUS_SUCCESS && *root) {
 		switch_xml_free(*root);
 		*root = NULL;
 		*domain = NULL;