vtest: fix some warnings

vtest/vtest_renderer.c

@@ -277,7 +277,6 @@ int vtest_resource_busy_wait(void)
 {
   uint32_t bw_buf[VCMD_BUSY_WAIT_SIZE];
   int ret;
-  int handle;
   int flags;
   uint32_t hdr_buf[VTEST_HDR_SIZE];
   uint32_t reply_buf[1];
@@ -286,7 +285,7 @@ int vtest_resource_busy_wait(void)
   if (ret != sizeof(bw_buf))
     return -1;
 
-  handle = bw_buf[VCMD_BUSY_WAIT_HANDLE];
+  /*  handle = bw_buf[VCMD_BUSY_WAIT_HANDLE]; unused as of now */
   flags = bw_buf[VCMD_BUSY_WAIT_FLAGS];
 
   if (flags == VCMD_BUSY_WAIT_FLAG_WAIT) {

vtest/vtest_server.c

@@ -142,7 +142,7 @@ fail:
 
 int main(int argc, char **argv)
 {
-    int sock, new_fd, ret;
+    int sock, new_fd;
     pid_t pid;
     bool do_fork = true;
     struct sigaction sa;