tbs2910: Fix error handling in board_mmc_init()
When an invalid USDHC port is passed we should return -EINVAL instead of 0. Also, return the error immediately on fsl_esdhc_initialize() failure. Based on similar patches by Fabio Estevam for mx6sabresd, mx53loco, wandboard Signed-off-by: NSoeren Moch <smoch@web.de> Acked-by: NStefano Babic <sbabic@denx.de>
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