rtl8723bs: os_dep: ioctl_linux: fix several braces coding style issues.

Fix checkpatch issues:
ERROR: that open brace { should be on the previous line.
WARNING: braces {} are not necessary for single statement blocks.

Signed-off-by: Teo Dacquet <teo.dacquet@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>