Staging: rtl8187se: fix if statement

I removed a misplace semicolon.  It is clear from the indentation that
TxPwrTracking87SE() was only supposed to be called if CheckTxPwrTracking()
returned true.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>