Fix wcmForeachDevice check in wcmMatchDevice

wcmForeachDevice returns 0 for no matches, a negative errno or the
greater-than-zero number of matches. In wcmMatchDevice we return either
0 or 1 as matchDevice() stops the foreach once the first match is
encountered.

Fixes: d5ca999 ("Add a helper function to iterate over local devices to the driver layer")
Closes #342

Author: whot

src/wcmConfig.c

@@ -413,7 +413,7 @@ static Bool wcmMatchDevice(WacomDevicePtr priv, WacomCommonPtr *common_return)
 		return 0;
 
 	/* If a match is found, priv->common has been replaced */
-	if (wcmForeachDevice(priv, matchDevice, priv) == 0)
+	if (wcmForeachDevice(priv, matchDevice, priv) > 0)
 		*common_return = priv->common;
 	return 0;
 }