tests: Bluetooth: Tester: Fix accessing out of scope variables in VCP

Input and output descriptors are writable storage for VCP parameters
and shall be valid for use duration. This fix usage of variables being
used outside of their declaration scope.

Signed-off-by: Szymon Janc <[email protected]>

Author: sjanc

tests/bluetooth/tester/src/audio/btp_vcp.c

@@ -465,10 +465,10 @@ struct bt_aics_cb aics_server_cb = {
 /* General profile handling */
 static void set_register_params(uint8_t gain_mode)
 {
-	char input_desc[CONFIG_BT_VCP_VOL_REND_AICS_INSTANCE_COUNT]
-		       [BT_AICS_MAX_INPUT_DESCRIPTION_SIZE];
-	char output_desc[CONFIG_BT_VCP_VOL_REND_VOCS_INSTANCE_COUNT]
-			[BT_AICS_MAX_OUTPUT_DESCRIPTION_SIZE];
+	static char input_desc[CONFIG_BT_VCP_VOL_REND_AICS_INSTANCE_COUNT]
+			      [BT_AICS_MAX_INPUT_DESCRIPTION_SIZE];
+	static char output_desc[CONFIG_BT_VCP_VOL_REND_VOCS_INSTANCE_COUNT]
+			      [BT_AICS_MAX_OUTPUT_DESCRIPTION_SIZE];
 
 	memset(&vcp_register_param, 0, sizeof(vcp_register_param));