remoteproc: imx_rproc: Fix NULL vs IS_ERR() bug in imx_rproc_addr_init()

commit 665eebe upstream.

The devm_ioremap_resource_wc() function never returns NULL, it returns
error pointers.  Update the error checking to match.

Fixes: 67a7bc7 ("remoteproc: Use of_reserved_mem_region_* functions for "memory-region"")
Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20260227091546.4044246-1-nichen@iscas.ac.cn
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Chen Ni

drivers/remoteproc/imx_rproc.c

@@ -812,7 +812,7 @@ static int imx_rproc_addr_init(struct imx_rproc *priv,
 
 		/* Not use resource version, because we might share region */
 		priv->mem[b].cpu_addr = devm_ioremap_resource_wc(&pdev->dev, &res);
-		if (!priv->mem[b].cpu_addr) {
+		if (IS_ERR(priv->mem[b].cpu_addr)) {
 			dev_err(dev, "failed to remap %pr\n", &res);
 			return -ENOMEM;
 		}