asoc: wcd-mbhc: check mbhc pointer to null before access

Check MBHC structure pointer to null before accessing.

Change-Id: I21230b524a702dc5880904160d80f9f19564fc3a
Signed-off-by: Phani Kumar Uppalapati <quic_phaniu@quicinc.com>

asoc/codecs/wcd-mbhc-v2.c

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /* Copyright (c) 2015-2021, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
  */
 #include <linux/module.h>
 #include <linux/init.h>
@@ -1142,6 +1143,10 @@ static irqreturn_t wcd_mbhc_mech_plug_detect_irq(int irq, void *data)
 
 	pr_debug("%s: enter\n", __func__);
 
+	if (mbhc == NULL) {
+		pr_err("%s: NULL irq data\n", __func__);
+		return IRQ_NONE;
+	}
 	/* WCD USB AATC did not required mech plug detection, will receive
 	 * insertion/removal events from UCSI layer
 	 */
@@ -1152,10 +1157,6 @@ static irqreturn_t wcd_mbhc_mech_plug_detect_irq(int irq, void *data)
 	}
 #endif
 
-	if (mbhc == NULL) {
-		pr_err("%s: NULL irq data\n", __func__);
-		return IRQ_NONE;
-	}
 	if (unlikely((mbhc->mbhc_cb->lock_sleep(mbhc, true)) == false)) {
 		pr_warn("%s: failed to hold suspend\n", __func__);
 		r = IRQ_NONE;