binfmt: Let binfmt_copyargv return error code

so the caller can distinguish the empty argument and out of memory quickly

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

binfmt/binfmt_execmodule.c

@@ -142,26 +142,23 @@ int exec_module(FAR const struct binary_s *binp,
       return -ENOMEM;
     }
 
-  if (argv)
+  ret = binfmt_copyargv(&argv, argv);
+  if (ret < 0)
     {
-      argv = binfmt_copyargv(argv);
-      if (!argv)
-        {
-          ret = -ENOMEM;
-          goto errout_with_tcb;
-        }
+      goto errout_with_tcb;
     }
 
   /* Make a copy of the environment here */
 
-  if (envp || (envp = environ))
+  if (envp == NULL)
     {
-      envp = binfmt_copyenv(envp);
-      if (!envp)
-        {
-          ret = -ENOMEM;
-          goto errout_with_args;
-        }
+      envp = environ;
+    }
+
+  ret = binfmt_copyenv(&envp, envp);
+  if (ret < 0)
+    {
+      goto errout_with_args;
     }
 
 #if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_BUILD_KERNEL)