When writing hex integer values, use "0" rather than "0x0"

upgrade_to_v320.js sets these values to just "0", so let's not thrash on the
format.

src/xpdev/ini_file.c

@@ -730,8 +730,9 @@ char* iniSetULongInt(str_list_t* list, const char* section, const char* key, ulo
 char* iniSetHexInt(str_list_t* list, const char* section, const char* key, uint value
 					,ini_style_t* style)
 {
-	char	str[INI_MAX_VALUE_LEN];
+	char	str[INI_MAX_VALUE_LEN] = "0";
 
+	if(value)
 		SAFEPRINTF(str,"0x%x",value);
 	return iniSetString(list, section, key, str, style);
 }
@@ -739,8 +740,9 @@ char* iniSetHexInt(str_list_t* list, const char* section, const char* key, uint
 char* iniSetHexInt64(str_list_t* list, const char* section, const char* key, uint64_t value
 					,ini_style_t* style)
 {
-	char	str[INI_MAX_VALUE_LEN];
+	char	str[INI_MAX_VALUE_LEN] = "0";
 
+	if(value)
 		SAFEPRINTF(str,"0x%" PRIx64, value);
 	return iniSetString(list, section, key, str, style);
 }