Rename the member variable bUsingBa to using_ba. This change clears the
checkpatch issue with CamelCase naming.

The resulting changes are purely coding style and should not impact
runtime code execution.
Signed-off-by: John Whitmore <johnfwhitmore@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>