staging:rtl8192u: Rename Addr > addr - Style

Rename the TX_COMMON_INFO structure's member Addr to addr. This change
clears the checkpatch issue with CamelCase naming. This is a coding style
change only and should not impact runtime execution.

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