Staging: r8188eu: core: rtw_xmit: Fixed some whitespace coding style issues

Removed superfluous blank lines and added blank lines after variable
declarations as per checkpath.pl

Signed-off-by: Chang Yu <marcus.yu.56@gmail.com>
Link: https://lore.kernel.org/r/841716cec5032ad706fbee8677e1b67aec8ad736.1655666628.git.marcus.yu.56@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>