hal: renesas: rx: Fix the build warning inside lvd driver

Fix the build warning related to variable declaration

Signed-off-by: Quy Tran <[email protected]>

Author: quytranpzz

drivers/rx/README

@@ -77,3 +77,7 @@ Patch List:
    Impacted files:
       drivers/rx/rdp/src/r_lvd_rx/src/r_lvd_rx_hw.c
       drivers/rx/rdp/src/r_lvd_rx/r_lvd_rx_if.h
+
+   * Fix the build warnings in LVD driver
+   Impacted files:
+      drivers/rx/rdp/src/r_lvd_rx/src/r_lvd_rx_hw.c

drivers/rx/rdp/src/r_lvd_rx/src/r_lvd_rx_hw.c

@@ -1298,21 +1298,19 @@ void lvd_hw_enable_nmi(lvd_channel_t ch, bool b_enable_flag)
 ***********************************************************************************************************************/
 void lvd_hw_dummy_read_dfilter(lvd_channel_t ch)
 {
-    uint8_t volatile dummy_read;
-
     if (LVD_CHANNEL_1 == ch)
     {
 #if (LVD_ENABLE == LVD_SUPPORT_DFILTER_CH1)
         /* Read dummy */
-        dummy_read = SYSTEM.LVD1CR0.BIT.LVD1DFDIS;
+        uint8_t volatile dummy_read = SYSTEM.LVD1CR0.BIT.LVD1DFDIS;
 #endif
     }
 #ifndef  BSP_MCU_RX23W
     else
     {
 #if (LVD_ENABLE == LVD_SUPPORT_DFILTER_CH2)
         /* Read dummy */
-        dummy_read = SYSTEM.LVD2CR0.BIT.LVD2DFDIS;
+        uint8_t volatile dummy_read = SYSTEM.LVD2CR0.BIT.LVD2DFDIS;
 #endif
     }
 #endif