drivers: clock_control: stm32: clean up unnecessary code

This commit removes unnecessary initialization of the local variable
where its value is guaranteed to be overwritten by subsequent operations.

Signed-off-by: Pisit Sawangvonganan <[email protected]>

Author: ndrs-pst

drivers/clock_control/clock_stm32_ll_h5.c

@@ -696,8 +696,8 @@ static void set_up_fixed_clock_sources(void)
 
 int stm32_clock_control_init(const struct device *dev)
 {
-	uint32_t old_hclk_freq = 0;
-	int r = 0;
+	uint32_t old_hclk_freq;
+	int r;
 
 	ARG_UNUSED(dev);
 

drivers/clock_control/clock_stm32_ll_h7.c

@@ -835,8 +835,8 @@ int stm32_clock_control_init(const struct device *dev)
 	int r = 0;
 
 #if defined(CONFIG_CPU_CORTEX_M7)
-	uint32_t old_hclk_freq = 0;
-	uint32_t new_hclk_freq = 0;
+	uint32_t old_hclk_freq;
+	uint32_t new_hclk_freq;
 
 	/* HW semaphore Clock enable */
 #if defined(CONFIG_SOC_STM32H7A3XX) || defined(CONFIG_SOC_STM32H7A3XXQ) || \

drivers/clock_control/clock_stm32_ll_u5.c

@@ -804,8 +804,8 @@ static void set_up_fixed_clock_sources(void)
 
 int stm32_clock_control_init(const struct device *dev)
 {
-	uint32_t old_hclk_freq = 0;
-	int r = 0;
+	uint32_t old_hclk_freq;
+	int r;
 
 	ARG_UNUSED(dev);
 

drivers/clock_control/clock_stm32_ll_wba.c

@@ -510,7 +510,7 @@ static void set_up_fixed_clock_sources(void)
 int stm32_clock_control_init(const struct device *dev)
 {
 	uint32_t old_flash_freq;
-	int r = 0;
+	int r;
 
 	ARG_UNUSED(dev);