staging:rtl8192u: Rename TClass > t_class - Style

Rename the struct TS_COMMON_INFO member variable from TClass to t_class. This
change clears the checkpatch issue with CamelCase Variable names. There should
be no impact on runtime execution.

Signed-off-by: John Whitmore <johnfwhitmore@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>