Ensure #'magic:find-file-noselect creates unique buffers

Ensure #'magic:find-file-noselect creates unique buffers

Having `magic:find-file-magic-alist-enable' features turned on, the
following scenario could eventuate...

  C-x C-f /path/one/to/a/file/called/Wanda

  C-x C-f /path/two/to/another/file/called/Wanda

would result in the *same* buffer being used for *both* files.
Imagine the fun, especially when both paths are writable for you.

This change fixes that.

	* lisp/ffi/ffi-magic.el (magic:find-file-noselect): Use
	#'create-file-buffer, not #'get-buffer-create. Gah! What was I
	thinking?!

Signed-off-by: Steve Youngs <steve@sxemacs.org>