mmc: meson-mx-sdio: Cleanup IS_ERR() checks

Using PTR_ERR_OR_ZERO() instead of IS_ERR() works, but it's not how
you're supposed to write these conditions.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/meson-mx-sdio.c

@@ -602,7 +602,7 @@ static int meson_mx_mmc_register_clks(struct meson_mx_mmc_host *host)
 
 	host->fixed_factor_clk = devm_clk_register(host->controller_dev,
 						 &host->fixed_factor.hw);
-	if (WARN_ON(PTR_ERR_OR_ZERO(host->fixed_factor_clk)))
+	if (WARN_ON(IS_ERR(host->fixed_factor_clk)))
 		return PTR_ERR(host->fixed_factor_clk);
 
 	clk_div_parent = __clk_get_name(host->fixed_factor_clk);
@@ -620,7 +620,7 @@ static int meson_mx_mmc_register_clks(struct meson_mx_mmc_host *host)
 
 	host->cfg_div_clk = devm_clk_register(host->controller_dev,
 					      &host->cfg_div.hw);
-	if (WARN_ON(PTR_ERR_OR_ZERO(host->cfg_div_clk)))
+	if (WARN_ON(IS_ERR(host->cfg_div_clk)))
 		return PTR_ERR(host->cfg_div_clk);
 
 	return 0;