staging: rtl8723bs: hal: Replace sprintf with scnprintf

staging: rtl8723bs: hal: Replace sprintf with scnprintf

The use of sprintf with format string here means that there is a risk
that the writes will go out of bounds, replace it with scnprintf.

Also avoid unnecessarily passing "%s" on some of the function calls.

Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Candy Febriyanto <cfebriyanto@gmail.com>
Link: https://lore.kernel.org/r/ed564fb9e325f757b2b937df37689d40b96d8831.1614610197.git.cfebriyanto@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>