wil6210: fix check for sparrow D0 FW file

Driver fails to load FW for sparrow D0 devices in some cases.
Fix this by returning correct value from wil_fw_verify_file_exists
when D0 FW file is not detected for any reason.

Signed-off-by: Hamad Kadmany <qca_hkadmany@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/wil6210/fw_inc.c

@@ -554,5 +554,7 @@ bool wil_fw_verify_file_exists(struct wil6210_priv *wil, const char *name)
 	rc = request_firmware(&fw, name, wil_to_dev(wil));
 	if (!rc)
 		release_firmware(fw);
-	return rc != -ENOENT;
+	else
+		wil_dbg_fw(wil, "<%s> not available: %d\n", name, rc);
+	return !rc;
 }