staging: rtl8723bs: hal: sdio_ops: fix braces {} are not necessary for single statement blocks

This patch fixes below issue reported by checkpatch

WARNING: braces {} are not necessary for single statement blocks

Signed-off-by: Hariprasad Kelam <hariprasad.kelam@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>