[PATCH] VIM3: mmc_get_env_dev correct non emmc boot sources

[Artem Lapkin <email2tema@gmail.com>]

need return -1 if boot source is not EMMC or SD ( for example it will be
useful if we have multy env sources configuration and device was booted
from SPI flash and env need read from SPI not from mmc )

Signed-off-by: Artem Lapkin <art@khadas.com>
---
 board/amlogic/vim3/vim3.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/board/amlogic/vim3/vim3.c b/board/amlogic/vim3/vim3.c
index 6cd5f2e1..71aaa0d8 100644
--- a/board/amlogic/vim3/vim3.c
+++ b/board/amlogic/vim3/vim3.c
@@ -19,9 +19,15 @@
 
 int mmc_get_env_dev(void)
 {
-	if (meson_get_boot_device() == BOOT_DEVICE_EMMC)
+	switch (meson_get_boot_device()) {
+	case BOOT_DEVICE_EMMC:
 		return 2;
-	return 1;
+	case BOOT_DEVICE_SD:
+		return 1;
+	default:
+		/* boot device is not EMMC|SD */
+		return -1;
+	}
 }
 
 /*
-- 
2.25.1