Add the missing platform_device_unregister() before return from
qtnf_core_mac_alloc() in the error handling case.

Fixes: 616f5701f4ab ("qtnfmac: assign each wiphy to its own virtual platform device")
Reported-by: Hulk Robot <redacted>
Signed-off-by: Wang Hai <redacted>
---
 drivers/net/wireless/quantenna/qtnfmac/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/quantenna/qtnfmac/core.c b/drivers/net/wireless/quantenna/qtnfmac/core.c
index eea777f8acea..6aafff9d4231 100644
--- a/drivers/net/wireless/quantenna/qtnfmac/core.c
+++ b/drivers/net/wireless/quantenna/qtnfmac/core.c

@@ -446,8 +446,11 @@ static struct qtnf_wmac *qtnf_core_mac_alloc(struct qtnf_bus *bus,
 	}
 
 	wiphy = qtnf_wiphy_allocate(bus, pdev);
-	if (!wiphy)
+	if (!wiphy) {
+		if (pdev)
+			platform_device_unregister(pdev);
 		return ERR_PTR(-ENOMEM);
+	}
 
 	mac = wiphy_priv(wiphy);