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Add error reporting to of_amba_device_create() so the user knows when (and why) some device tree nodes fail to initialize. [ The issue was spotted on Universal C210 board (using revision 0 of ARM Exynos4210 SoC) on which initialization was silently failing for PL330 MDMA1 device tree node (it was using the wrong addres resulting in amba_device_add() returning -ENODEV). ] Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Grant Likely <grant.likely@linaro.org>