universal7885: dlopener: Use more common exit code

universal7885-common/debug-tools/dlopener/dlopener.c

@@ -1,27 +1,26 @@
 #include <dlfcn.h>
-#include <errno.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 int main(int argc, char *argv[]) {
   const char *path;
-  int status = -EINVAL;
   void *handle = NULL;
+  int ret = EXIT_FAILURE;
 
   if (argc <= 1) {
     printf("Please specify a module to load!\n");
-    return status;
+    return ret;
   }
 
   path = argv[1];
 
   handle = dlopen(path, RTLD_NOW);
   if (handle == NULL) {
-    char const *err_str = dlerror();
+    const char *err_str = dlerror();
     printf("load: module=%s\n%s\n", path, err_str ? err_str : "unknown");
-    status = -EINVAL;
   } else {
     printf("load: module=%s %s\n", path, "Success!");
+    ret = EXIT_SUCCESS;
   }
-
-  return status;
+  return ret;
 }