fix some calendar-related leaks and issues

src/calendar.c

@@ -38,22 +38,34 @@ void calendar_cleanup(void)
 
     free(agename);
 
-    for (i = 0; i != seasons; ++i) {
-        free(seasonnames[i]);
+    if (seasonnames) {
+        for (i = 0; i != seasons; ++i) {
+            free(seasonnames[i]);
+        }
+        free(seasonnames);
+        seasonnames = 0;
     }
-    free(seasonnames);
 
-    for (i = 0; i != months_per_year; ++i) {
-        free(monthnames[i]);
+    if (monthnames) {
+        for (i = 0; i != months_per_year; ++i) {
+            free(monthnames[i]);
+        }
+        free(storms);
+        storms = 0;
+        free(month_season);
+        month_season = 0;
+        free(monthnames);
+        monthnames = 0;
     }
-    free(storms);
-    free(month_season);
-    free(monthnames);
 
     for (i = 0; i != weeks_per_month; ++i) {
-        free(weeknames[i]);
-        free(weeknames2[i]);
+        if (weeknames)
+            free(weeknames[i]);
+        if (weeknames2)
+            free(weeknames2[i]);
     }
     free(weeknames);
+    weeknames = 0;
     free(weeknames2);
+    weeknames2 = 0;
 }

src/eressea.c

@@ -26,6 +26,7 @@
 #include <util/message.h>
 #include <races/races.h>
 
+#include "calendar.h"
 #include "chaos.h"
 #include "creport.h"
 #include "items.h"
@@ -50,8 +51,8 @@ void game_done(void)
 #ifdef REPORT_FORMAT_NR
     report_cleanup();
 #endif
-    calendar_cleanup();
 #endif
+    calendar_cleanup();
     free_functions();
     free_config();
     free_locales();

src/kernel/xmlreader.c

@@ -471,6 +471,8 @@ static int parse_calendar(xmlDocPtr doc)
             }
             xmlXPathFreeObject(xpathMonths);
             xmlXPathFreeObject(xpathSeasons);
+            xmlFree(newyear);
+            newyear = NULL;
         }
     xmlXPathFreeObject(xpathCalendars);
     xmlXPathFreeContext(xpath);

tests/test-turn.lua

@@ -3,3 +3,4 @@ turn = get_turn()
 eressea.free_game()
 print("trying to read data from " .. turn)
 eressea.read_game(turn .. ".dat")
+eressea.free_game()