staging/rtl8723bs/core: remove inactive initialization

The allocation address of the psta pointer variable is first performed
in the function, no initialization assignment is required, and no
invalid pointer will appear.
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Li zeming <zeming@nfschina.com>
Link: https://lore.kernel.org/r/20220802012513.2824-1-zeming@nfschina.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/core/rtw_mlme.c

@@ -2521,7 +2521,7 @@ void rtw_issue_addbareq_cmd(struct adapter *padapter, struct xmit_frame *pxmitfr
 {
 	u8 issued;
 	int priority;
-	struct sta_info *psta = NULL;
+	struct sta_info *psta;
 	struct ht_priv *phtpriv;
 	struct pkt_attrib *pattrib = &pxmitframe->attrib;
 	s32 bmcst = IS_MCAST(pattrib->ra);