In case of error, the function devm_ioremap_resource() returns ERR_PTR()Applied
and never returns NULL. The NULL test in the return value check should
be replaced with IS_ERR().
Fixes: 3e99cb214f03 ("soc: ti: add initial PRM driver with reset control support")
Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
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