Fixed crash-bug in sector.c.

Author: DanielBrockhaus

src/sector.c

@@ -64,6 +64,8 @@ void set_sector(int x, int y) {
     int n, m;
     unsigned long long prof;
 
+    if (x < 0 || x >= MAXMAP || y < 0 || y >= MAXMAP) return;
+
     prof = prof_start(21);
 
     for (n = 0; n < 8; n++) {
@@ -78,6 +80,8 @@ void set_sector(int x, int y) {
 int skipx_sector(int x, int y) {
     int n, m, size;
 
+    if (x < 0 || x >= MAXMAP || y < 0 || y >= MAXMAP) return 0;
+
     for (n = 7; n >= 0; n--) {
         m = (x >> n) + (y >> n) * (MAXMAP >> n);