fix double free

src/location/Ip2location.zig

@@ -253,7 +253,12 @@ pub const Cache = struct {
     }
 
     pub fn get(self: *Cache, ip: u128) ?Location {
-        return self.entries.get(ip);
+        const entry = self.entries.get(ip) orelse return null;
+        return .{
+            .allocator = self.allocator,
+            .name = self.allocator.dupe(u8, entry.name) catch return null,
+            .coords = entry.coords,
+        };
     }
 
     pub fn put(self: *Cache, ip: u128, family: u8, loc: Location) !void {