soc: qcom: rmtfs: fix error handling reading qcom,vmid

of_property_count_u32_elems returns a negative integer when an error
happens , but since the value was assigned to an unsigned integer, the
check never worked correctly. Also print the correct variable in the
error print, ret isn't used here.

Fixes: e656cd0 ("soc: qcom: rmtfs: Optionally map RMTFS to more VMs")
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230305-rmtfs-vmid-fix-v1-1-6a7206081602@z3ntu.xyz

Author: z3ntu

drivers/soc/qcom/rmtfs_mem.c

@@ -176,7 +176,8 @@ static int qcom_rmtfs_mem_probe(struct platform_device *pdev)
 	struct reserved_mem *rmem;
 	struct qcom_rmtfs_mem *rmtfs_mem;
 	u32 client_id;
-	u32 num_vmids, vmid[NUM_MAX_VMIDS];
+	u32 vmid[NUM_MAX_VMIDS];
+	int num_vmids;
 	int ret, i;
 
 	rmem = of_reserved_mem_lookup(node);
@@ -229,7 +230,7 @@ static int qcom_rmtfs_mem_probe(struct platform_device *pdev)
 
 	num_vmids = of_property_count_u32_elems(node, "qcom,vmid");
 	if (num_vmids < 0) {
-		dev_err(&pdev->dev, "failed to count qcom,vmid elements: %d\n", ret);
+		dev_err(&pdev->dev, "failed to count qcom,vmid elements: %d\n", num_vmids);
 		goto remove_cdev;
 	} else if (num_vmids > NUM_MAX_VMIDS) {
 		dev_warn(&pdev->dev,