main: use unsiged int as the return type of countFields

Signed-off-by: Masatake YAMATO <[email protected]>

Author: masatake

main/field.c

@@ -1285,7 +1285,7 @@ extern bool doesFieldHaveRenderer (fieldType type, bool noEscaping)
 		return getFieldObject(type)->def->render? true: false;
 }
 
-extern int countFields (void)
+extern unsigned int countFields (void)
 {
 	return fieldObjectUsed;
 }

main/field_p.h

@@ -64,7 +64,7 @@ extern const char* renderFieldNoEscaping (fieldType type, const tagEntryInfo *ta
 extern bool  doesFieldHaveTabOrNewlineChar (fieldType type, const tagEntryInfo *tag, int index);
 
 extern void initFieldObjects (void);
-extern int countFields (void);
+extern unsigned int countFields (void);
 
 /* language should be typed to langType.
    Use int here to avoid circular dependency */

main/options.c

@@ -1345,9 +1345,7 @@ static void processExtraTagsOption (
 
 static void resetFieldsOption (langType lang, bool mode)
 {
-	int i;
-
-	for (i = 0; i < countFields (); ++i)
+	for (unsigned int i = 0; i < countFields (); ++i)
 		if ((lang == LANG_AUTO) || (lang == getFieldOwner (i)))
 			enableField (i, mode);
 

main/parse.c

@@ -4945,7 +4945,7 @@ extern bool makeFieldDescriptionsPseudoTags (const langType language,
 											 const ptagDesc *pdesc)
 {
 	bool written = false;
-	for (int i = 0; i < countFields (); i++)
+	for (unsigned int i = 0; i < countFields (); i++)
 	{
 		if (getFieldOwner (i) == language
 			&& isFieldEnabled (i))