CI check: fix nxstyle warning

nxstyle fixes to reduce the CI warnings

Signed-off-by: chao.an <anchao@xiaomi.com>

graphics/nxmu/nxmu_start.c

@@ -196,13 +196,13 @@ int nxmu_start(int display, int plane)
     {
       FAR char display_str[8];
       FAR char plane_str[8];
+      pid_t server;
       FAR char * const argv[3] =
       {
         (FAR char * const)display_str,
         (FAR char * const)plane_str,
         NULL
       };
-      pid_t server;
 
       /* Start the server kernel thread */
 
@@ -225,7 +225,7 @@ int nxmu_start(int display, int plane)
        * this operation cannot be done from the IDLE thread!
        */
 
-      nxsig_usleep(50*1000);
+      nxsig_usleep(50 * 1000);
     }
 
   return OK;