staging: rtl8723bs: remove unnecessary braces for single statement blocks

Remove all unnecessary braces for single-statement blocks in
`os_dep/recv_linux.c` to conform to code style rules.

Warnings reported by checkpatch.pl:

* WARNING: braces {} are not necessary for single statement blocks
* WARNING: braces {} are not necessary for any arm of this statement

Signed-off-by: David Tadokoro <davidbtadokoro@usp.br>
Link: https://lore.kernel.org/r/20250521075831.485199-1-davidbtadokoro@gmail.com


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