staging: rtl8723bs: core: rtw_mlme: Remove a bunch of unused variables

staging: rtl8723bs: core: rtw_mlme: Remove a bunch of unused variables

Fixes the following W=1 kernel build warning(s):

 drivers/staging/rtl8723bs/core/rtw_mlme.c: In function ‘rtw_build_wmm_ie_ht’:
 drivers/staging/rtl8723bs/core/rtw_mlme.c:2482:6: warning: variable ‘pframe’ set but not used [-Wunused-but-set-variable]
 drivers/staging/rtl8723bs/core/rtw_mlme.c: In function ‘rtw_restructure_ht_ie’:
 drivers/staging/rtl8723bs/core/rtw_mlme.c:2498:21: warning: variable ‘pframe’ set but not used [-Wunused-but-set-variable]
 drivers/staging/rtl8723bs/core/rtw_mlme.c: In function ‘rtw_update_ht_cap’:
 drivers/staging/rtl8723bs/core/rtw_mlme.c:2647:33: warning: variable ‘pht_addtinfo’ set but not used [-Wunused-but-set-variable]
 from drivers/staging/rtl8188eu/core/rtw_mlme.c:12:

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-staging@lists.linux.dev
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210414181129.1628598-11-lee.jones@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>