FS-7046 fix warning introduced from b341ff7c properly

src/mod/endpoints/mod_verto/mod_verto.c

@@ -1518,7 +1518,7 @@ new_req:
 		!strncmp(request.content_type, "application/x-www-form-urlencoded", 33)) {
 
 		char *buffer = NULL;
-		switch_size_t len = 0, bytes = 0;
+		switch_ssize_t len = 0, bytes = 0;
 
 		if (request.content_length > 2 * 1024 * 1024 - 1) {
 			char *data = "HTTP/1.1 413 Request Entity Too Large\r\n"
@@ -1538,8 +1538,8 @@ new_req:
 		while(bytes < request.content_length) {
 			len = request.content_length - bytes;
 
-			if ((switch_ssize_t)(len = ws_raw_read(&jsock->ws, buffer + bytes, len, jsock->ws.block)) < 0) {
-				switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Read error %" SWITCH_SIZE_T_FMT"\n", len);
+			if ((len = ws_raw_read(&jsock->ws, buffer + bytes, len, jsock->ws.block)) < 0) {
+				switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Read error %" SWITCH_SSIZE_T_FMT"\n", len);
 				goto done;
 			}