firmware: qcom: scm: preserve assign_mem() error return value

JIRA: https://issues.redhat.com/browse/RHEL-117514

commit 121fcf3
Author: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
Date:   Thu Aug 7 18:14:51 2025 +0530

    firmware: qcom: scm: preserve assign_mem() error return value

    When qcom_scm_assign_mem() fails, the error value is currently being
    overwritten after it is logged, resulting in the loss of the original
    error code. Fix this by retaining and returning the original error value
    as intended.

    Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
    Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
    Link: https://lore.kernel.org/r/20250807124451.2623019-1-mukesh.ojha@oss.qualcomm.com
    Signed-off-by: Bjorn Andersson <andersson@kernel.org>

Signed-off-by: Eric Chanudet <echanude@redhat.com>

Author: eric-ch

drivers/firmware/qcom/qcom_scm.c

@@ -1119,7 +1119,7 @@ int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz,
 	if (ret) {
 		dev_err(__scm->dev,
 			"Assign memory protection call failed %d\n", ret);
-		return -EINVAL;
+		return ret;
 	}
 
 	*srcvm = next_vm;