staging: r8188eu: make OnBeacon static

OnBeacon is used only in rtw_mlme_ext.c. Make this function static.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Link: https://lore.kernel.org/r/20221024081417.66441-7-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_mlme_ext.c

@@ -561,7 +561,7 @@ static unsigned int OnProbeRsp(struct adapter *padapter, struct recv_frame *prec
 	return _SUCCESS;
 }
 
-unsigned int OnBeacon(struct adapter *padapter, struct recv_frame *precv_frame)
+static unsigned int OnBeacon(struct adapter *padapter, struct recv_frame *precv_frame)
 {
 	int cam_idx;
 	struct sta_info	*psta;

drivers/staging/r8188eu/include/rtw_mlme_ext.h

@@ -536,8 +536,6 @@ void start_clnt_auth(struct adapter *padapter);
 void start_clnt_join(struct adapter *padapter);
 void start_create_ibss(struct adapter *padapter);
 
-unsigned int OnBeacon(struct adapter *padapter,
-		      struct recv_frame *precv_frame);
 unsigned int OnDisassoc(struct adapter *padapter,
 			struct recv_frame *precv_frame);
 unsigned int OnAuth(struct adapter *padapter,