firmware: qcom: scom: Simplify mutex with guard

Simplify error path unlocking mutex with the guard.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260216091525.107935-6-krzysztof.kozlowski@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

Author: krzk

drivers/firmware/qcom/qcom_scm.c

@@ -199,19 +199,18 @@ static int qcom_scm_bw_enable(void)
 	if (!__scm->path)
 		return 0;
 
-	mutex_lock(&__scm->scm_bw_lock);
+	guard(mutex)(&__scm->scm_bw_lock);
+
 	if (!__scm->scm_vote_count) {
 		ret = icc_set_bw(__scm->path, 0, UINT_MAX);
 		if (ret < 0) {
 			dev_err(__scm->dev, "failed to set bandwidth request\n");
-			goto err_bw;
+			return ret;
 		}
 	}
 	__scm->scm_vote_count++;
-err_bw:
-	mutex_unlock(&__scm->scm_bw_lock);
 
-	return ret;
+	return 0;
 }
 
 static void qcom_scm_bw_disable(void)