gcenumeration: don't check enum entry avalability on read

Fixes #678

Removing this check, we will not know anymore if the value returned by the
device is a valid one. But it is the device fault, as on write the availability
is still checked.

And know we avoid an infinite loop on some devices like the one in the issue
report.

src/arvgcenumeration.c

@@ -317,10 +317,6 @@ _get_int_value (ArvGcEnumeration *enumeration, GError **error)
 {
 	GError *local_error = NULL;
 	gint64 value;
-	gint64 *available_values;
-	unsigned n_values;
-	unsigned i;
-	gboolean found = FALSE;
 
 	g_return_val_if_fail (ARV_IS_GC_ENUMERATION (enumeration), 0);
 	g_return_val_if_fail (error == NULL || *error == NULL, 0);
@@ -336,30 +332,6 @@ _get_int_value (ArvGcEnumeration *enumeration, GError **error)
 		return 0;
 	}
 
-	available_values = arv_gc_enumeration_dup_available_int_values (enumeration, &n_values, &local_error);
-	if (local_error != NULL) {
-		g_propagate_error (error, local_error);
-		return value;
-	}
-
-	if (available_values == NULL) {
-		g_set_error (error, ARV_GC_ERROR, ARV_GC_ERROR_EMPTY_ENUMERATION,
-			     "[%s] No available entry",
-			     arv_gc_feature_node_get_name (ARV_GC_FEATURE_NODE (enumeration)));
-		return value;
-	}
-
-	for (i = 0; i < n_values; i++)
-		if (available_values[i] == value)
-			found = TRUE;
-
-	g_free (available_values);
-
-	if (!found)
-		g_set_error (error, ARV_GC_ERROR, ARV_GC_ERROR_OUT_OF_RANGE,
-			     "[%s] Value not found",
-			     arv_gc_feature_node_get_name (ARV_GC_FEATURE_NODE (enumeration)));
-
 	return value;
 }