[forms] str2type const char *

src/document/forms.c

@@ -42,7 +42,7 @@ static struct form_type_name form_type2name[] = {
 #define FORM_TYPE_COUNT (sizeof(form_type2name)/sizeof(struct form_type_name))
 
 enum form_type
-str2form_type(char *s)
+str2form_type(const char *s)
 {
 	int n;
 

src/document/forms.h

@@ -128,7 +128,7 @@ struct el_form_control {
 };
 
 /* Numerical form type <-> form type name */
-enum form_type str2form_type(char *s);
+enum form_type str2form_type(const char *s);
 char *form_type2str(enum form_type num);
 
 struct form *init_form(void);