[PATCH 5.2 56/85] mt76: Fix a signedness bug in mt7615_add_interface()

[Greg Kroah-Hartman]

From: Dan Carpenter <dan.carpen...@oracle.com>

commit b1571a0e77d8cef14227af293c6dda1464a57270 upstream.

The problem is that "mvif->omac_idx" is a u8 so it can't be negative
and the error handling won't work.  The get_omac_idx() function returns
-1 on error.

Fixes: 04b8e65922f6 ("mt76: add mac80211 driver for MT7615 PCIe-based chipsets")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
Signed-off-by: Felix Fietkau <n...@nbd.name>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/net/wireless/mediatek/mt76/mt7615/main.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/mediatek/mt76/mt7615/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/main.c
@@ -77,11 +77,12 @@ static int mt7615_add_interface(struct i
                goto out;
        }
 
-       mvif->omac_idx = get_omac_idx(vif->type, dev->omac_mask);
-       if (mvif->omac_idx < 0) {
+       idx = get_omac_idx(vif->type, dev->omac_mask);
+       if (idx < 0) {
                ret = -ENOSPC;
                goto out;
        }
+       mvif->omac_idx = idx;
 
        /* TODO: DBDC support. Use band 0 and wmm 0 for now */
        mvif->band_idx = 0;