drivers, char: Use {k,v}zalloc to allocate memory

Let memory allocator initialize the allocated memory as null, thus remove the use of memset.

---

index 966a95b..25d139c 100644
@@ -271,14 +271,13 @@ mspec_mmap(struct file *file, struct

vm_area_struct *vma,
pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; vdata_size = sizeof(struct vma_data) + pages * sizeof(long); if (vdata_size <= PAGE_SIZE)
- vdata = kmalloc(vdata_size, GFP_KERNEL);
+ vdata = kzalloc(vdata_size, GFP_KERNEL);
else {
- vdata = vmalloc(vdata_size);
+ vdata = vzalloc(vdata_size);
flags = VMD_VMALLOCED;
}
if (!vdata)
return -ENOMEM;
- memset(vdata, 0, vdata_size);

vdata->vm_start = vma->vm_start;
vdata->vm_end = vma->vm_end;