ARM: u300: fix return value check in __u300_init_boardpower()
In case of error, the function syscon_node_to_regmap() returns ERR_PTR() and never returns NULL. The NULL test in the return value check should be replaced with IS_ERR(). Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: NLinus Walleij <linus.walleij@stericsson.com>
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