Fix compiler warnings in filter.

e-util/e-xml-utils.h

@@ -92,8 +92,6 @@ void      e_xml_set_string_prop_by_name              (xmlNode       *parent,
 gchar    *e_xml_get_translated_string_prop_by_name   (const xmlNode *parent,
                                                       const xmlChar *prop_name);
 
-int e_xml_save_file (const char *filename, xmlDocPtr doc);
-
 G_END_DECLS
 
 #endif /* __E_XML_UTILS__ */

filter/filter-file.c

@@ -208,7 +208,7 @@ xml_encode (FilterElement *fe)
 {
 	FilterFile *file = (FilterFile *) fe;
 	xmlNodePtr cur, value;
-	char *type;
+	const gchar *type;
 
 	type = file->type ? file->type : "file";
 

filter/filter-input.c

@@ -237,7 +237,7 @@ xml_encode (FilterElement *fe)
 	xmlNodePtr value;
 	GList *l;
 	FilterInput *fi = (FilterInput *)fe;
-	char *type;
+	const gchar *type;
 
 	type = fi->type ? fi->type : "string";
 

filter/rule-editor.c

@@ -639,7 +639,7 @@ rule_bottom (GtkWidget *widget, RuleEditor *re)
 }
 
 static struct {
-	char *name;
+	const gchar *name;
 	GCallback func;
 } edit_buttons[] = {
 	{ "rule_add",    G_CALLBACK (rule_add)    },