请问一下这是为什么啊，说error C2040: “twoSum”:“int *(int *,int,int,int *)”与“int ()”的间接寻址级别不同

main(){
    int nums[] = {2,7,11,15};
    int target = 9;
    int nsize = 4;
    int *rs;
    int *x;
    x = twoSum(nums,nsize,target,rs);
   
   
}
////////////////////////////////////////main
int* twoSum(int* nums, int numsSize, int target, int* returnSize){
    int *a = (int *)malloc(sizeof(int) * 2);
    int i, j;
    for (i = 0; i < numsSize - 1; i++) {
        for (j = i + 1; j < numsSize; j++) {
            if (nums[i] + nums[j] == target) {
                a[0] = i;
                a[1] = j;
                *returnSize = 2;
                return a;
            }
        }
    }               
    *returnSize = 0;
    return a;
}