staging: rtl8723bs: core: rtw_efuse.c: Compress two lines into one line

Challenge suggested by coccinelle.
Return value directly without saving it in a variable and remove that
variable.

Signed-off-by: Payal Kshirsagar <payal.s.kshirsagar.98@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>