env: nowhere: Cosmetic fix

Use spaces instead of tabs in assignments, since there are no lines to
align assignment values to.

Signed-off-by: Marek BehĂșn <marek.behun@nic.cz>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/env/nowhere.c b/env/nowhere.c
index dc93b6f..9ebc357 100644
--- a/env/nowhere.c
+++ b/env/nowhere.c
@@ -22,7 +22,7 @@
  */
 static int env_nowhere_init(void)
 {
-	gd->env_valid	= ENV_INVALID;
+	gd->env_valid = ENV_INVALID;
 
 	return 0;
 }
@@ -37,7 +37,7 @@
 	if (!IS_ENABLED(CONFIG_SPL_BUILD))
 		env_set_default(NULL, 0);
 
-	gd->env_valid	= ENV_INVALID;
+	gd->env_valid = ENV_INVALID;
 
 	return 0;
 }