staging:rtl8192u: Rename TClasNum > t_clas_num - Style

Rename the struct TS_COMMON_INFO member variable TClasNum to t_clas_num. This
change clears the checkpatch issue with CamelCase naming. 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>