For CONFIG_ENV_FAT_INTERFACE != 'mmc' a link error
env/fat.c:93: undefined reference to `mmc_initialize'
occurs if CONFIG_MMC_SUPPORT is not enabled.
Fixes: 26862b4a40c3 ("env: mmc/fat/ext4: make sure that the MMC sub-system
is initialized before using it")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
        int err;
        loff_t off;
 
+#ifdef CONFIG_MMC
        if (!strcmp(CONFIG_ENV_EXT4_INTERFACE, "mmc"))
                mmc_initialize(NULL);
+#endif
 
        part = blk_get_device_part_str(CONFIG_ENV_EXT4_INTERFACE,
                                       CONFIG_ENV_EXT4_DEVICE_AND_PART,
 
        int dev, part;
        int err;
 
+#ifdef CONFIG_MMC
        if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc"))
                mmc_initialize(NULL);
+#endif
 
        part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
                                        CONFIG_ENV_FAT_DEVICE_AND_PART,