staging: r8188eu: convert _rtw_init_sta_priv() to common error logic

Convert the function _rtw_init_sta_priv() to common kernel error logic.
Return 0 on success and negative value on failure. This is part of
getting rid of returning _SUCCESS and _FAIL which uses inverted error
logic and is used all over the driver.
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Link: https://lore.kernel.org/r/20221002074827.8566-6-straube.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_sta_mgt.c

@@ -45,7 +45,7 @@ static void _rtw_init_stainfo(struct sta_info *psta)
 	psta->keep_alive_trycnt = 0;
 }
 
-u32	_rtw_init_sta_priv(struct	sta_priv *pstapriv)
+int _rtw_init_sta_priv(struct sta_priv *pstapriv)
 {
 	struct sta_info *psta;
 	s32 i;
@@ -53,7 +53,7 @@ u32	_rtw_init_sta_priv(struct	sta_priv *pstapriv)
 	pstapriv->pallocated_stainfo_buf = vzalloc(sizeof(struct sta_info) * NUM_STA + 4);
 
 	if (!pstapriv->pallocated_stainfo_buf)
-		return _FAIL;
+		return -ENOMEM;
 
 	pstapriv->pstainfo_buf = pstapriv->pallocated_stainfo_buf + 4 -
 		((size_t)(pstapriv->pallocated_stainfo_buf) & 3);
@@ -93,7 +93,7 @@ u32	_rtw_init_sta_priv(struct	sta_priv *pstapriv)
 	pstapriv->expire_to = 3; /*  3*2 = 6 sec */
 	pstapriv->max_num_sta = NUM_STA;
 
-	return _SUCCESS;
+	return 0;
 }
 
 inline int rtw_stainfo_offset(struct sta_priv *stapriv, struct sta_info *sta)

drivers/staging/r8188eu/include/sta_info.h

@@ -295,7 +295,7 @@ static inline u32 wifi_mac_hash(u8 *mac)
 	return x;
 }
 
-extern u32	_rtw_init_sta_priv(struct sta_priv *pstapriv);
+extern int _rtw_init_sta_priv(struct sta_priv *pstapriv);
 extern void _rtw_free_sta_priv(struct sta_priv *pstapriv);
 
 #define stainfo_offset_valid(offset) (offset < NUM_STA && offset >= 0)

drivers/staging/r8188eu/os_dep/os_intfs.c

@@ -494,7 +494,7 @@ u8 rtw_init_drv_sw(struct adapter *padapter)
 		goto free_xmit_priv;
 	}
 
-	if (_rtw_init_sta_priv(&padapter->stapriv) == _FAIL) {
+	if (_rtw_init_sta_priv(&padapter->stapriv)) {
 		dev_err(dvobj_to_dev(padapter->dvobj), "_rtw_init_sta_priv failed\n");
 		goto free_recv_priv;
 	}