[U-Boot] [PATCH v2 2/2] env_mmc: default to 0 if CONFIG_SYS_MMC_ENV_DEV not defined

[Hector Palacios]

Since function mmc_get_env_devno is __weak and can be overridden by
board code, boards do not need to mandatory define
CONFIG_SYS_MMC_ENV_DEV.
If the constant is not defined, define it to 0 by default.

Signed-off-by: Hector Palacios <hector.palacios at digi.com>
---

Notes:
    Changes since v1:
    - Use default define if not set

 common/env_mmc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/common/env_mmc.c b/common/env_mmc.c
index 570caf63aeae..c9df4c49e2b8 100644
--- a/common/env_mmc.c
+++ b/common/env_mmc.c
@@ -61,9 +61,14 @@ __weak int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
 	return 0;
 }
 
+#if !defined(CONFIG_SYS_MMC_ENV_DEV)
+#define CONFIG_SYS_MMC_ENV_DEV 0
+#endif
+
 __weak int mmc_get_env_devno(void)
 {
 	return CONFIG_SYS_MMC_ENV_DEV;
+}
 
 #if !defined(CONFIG_SYS_MMC_ENV_PART)
 #define CONFIG_SYS_MMC_ENV_PART 0