CodingStyle: add kmalloc_array() to memory allocators

		Chapter 14: Allocating memory

The kernel provides the following general purpose memory allocators:

kmalloc(), kzalloc(), kcalloc(), vmalloc(), and vzalloc().  Please refer to

the API documentation for further information about them.

kmalloc(), kzalloc(), kmalloc_array(), kcalloc(), vmalloc(), and

vzalloc().  Please refer to the API documentation for further information

about them.

The preferred form for passing a size of a struct is the following:

from void pointer to any other pointer type is guaranteed by the C programming

language.

The preferred form for allocating an array is the following:

	p = kmalloc_array(n, sizeof(...), ...);

The preferred form for allocating a zeroed array is the following:

	p = kcalloc(n, sizeof(...), ...);

Both forms check for overflow on the allocation size n * sizeof(...),

and return NULL if that occurred.

		Chapter 15: The inline disease