env: Drop saveenv() in favour of env_save()

Use the env_save() function directly now that there is only one
implementation of saveenv().

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Denk <wd@denx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/cmd/nvedit.c b/cmd/nvedit.c
index 75df997..4431ef6 100644
--- a/cmd/nvedit.c
+++ b/cmd/nvedit.c
@@ -710,7 +710,7 @@
 
 	printf("Saving Environment to %s...\n", env->name);
 
-	return saveenv() ? 1 : 0;
+	return env_save() ? 1 : 0;
 }
 
 U_BOOT_CMD(