STM32 library function for GPIO initialization

The following two pieces of code should be equivalent , But I found that it is OK to initialize with the above code , You can't initialize with the following code , I don't know why .

void KEY_Init(void) {
    
	GPIO_InitTypeDef GPIO_InitStruct;

	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOE,  ENABLE);
	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4;
	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPU;
	GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOE,  &GPIO_InitStruct);
	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPD;
	GPIO_Init(GPIOA, &GPIO_InitStruct);
}

void KEY_Init(void) {
    
	GPIO_InitTypeDef *GPIO_InitStruct;

	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOE,  ENABLE);
	GPIO_InitStruct->GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4;
	GPIO_InitStruct->GPIO_Mode = GPIO_Mode_IPU;
	GPIO_InitStruct->GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOE,  GPIO_InitStruct);
	GPIO_InitStruct->GPIO_Pin = GPIO_Pin_0;
	GPIO_InitStruct->GPIO_Mode = GPIO_Mode_IPD;
	GPIO_Init(GPIOA, GPIO_InitStruct);
}

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I am a pig ,

Defines a structure variable , But didn't let him point to the structure , Naturally, it's useless , Just change it to the above .