Staging: rtl8723bs: rtw_xmit: fixed tabbing issue

Fixed warning from checkpatch for code block not being indented
correctly.

Signed-off-by: Amos Gross <email@amosgross.com>
Link: https://lore.kernel.org/r/YIAVfRxQ+XmKEf47@arch.localdomain


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