staging: rtl8723bs: Clean up whitespace in 'PHY_GetTxPowerLimit()'.

Wrap lines longer than 80 characters where possible, delete double
newlines, and fix alignment per the kernel coding style guidelines.

Signed-off-by: Quytelda Kahja <quytelda@tamalin.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>