staging: rtl8723bs: Fix indenting warning in os_dep/xmit_linux.c

Smatch issues the warning

  CHECK   drivers/staging/rtl8723bs/os_dep/xmit_linux.c
drivers/staging/rtl8723bs/os_dep/xmit_linux.c:42 _rtw_pktfile_read() warn: inconsistent indenting

A simple indent changes fixes this.
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>