drivers/char/mspec.c: use {k,v}zalloc to allocate memory

Let memory allocator initialize the allocated memory as null, thus remove
the use of memset.
Signed-off-by: Rakib Mullick <rakib.mullick@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/char/mspec.c

@@ -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;