ASoC: hisilicon: Use IS_ERR() instead of IS_ERR_OR_NULL()

In the function hi6210_i2s_probe(), devm_clk_get() doesn't return NULL.
Thus use IS_ERR() to validate the return value instead of IS_ERR_OR_NULL().

Signed-off-by: Zhang Shengju <zhangshengju@cmss.chinamobile.com>
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Link: https://lore.kernel.org/r/20200427091145.4268-1-tangbin@cmss.chinamobile.com


Signed-off-by: Mark Brown <broonie@kernel.org>