fix more issues reported by coverity

src/win/win_dialog.c

@@ -139,7 +139,7 @@ file_dlg_w(HWND hwnd, WCHAR *f, WCHAR *fn, int save)
      * not use the contents of szFile to initialize itself.
      */
     memcpy(ofn.lpstrFile, fn, (wcslen(fn) << 1) + 2);
-    ofn.nMaxFile = 259;
+    ofn.nMaxFile = sizeof_w(wopenfilestring);
     ofn.lpstrFilter = f;
     ofn.nFilterIndex = 1;
     ofn.lpstrFileTitle = NULL;

src/win/win_settings.c

@@ -2846,6 +2846,7 @@ win_settings_hard_disks_add_proc(HWND hdlg, UINT message, WPARAM wParam, LPARAM
 					f = _wfopen(wopenfilestring, (existing & 1) ? L"rb" : L"wb");
 					if (f == NULL) {
 hdd_add_file_open_error:
+						fclose(f);
 						settings_msgbox(MBX_ERROR, (existing & 1) ? (wchar_t *)IDS_4107 : (wchar_t *)IDS_4108);
 						return TRUE;
 					}
@@ -2876,7 +2877,6 @@ hdd_add_file_open_error:
 						} else {
 							fseeko64(f, 0, SEEK_END);
 							size = ftello64(f);
-							fclose(f);
 							if (((size % 17) == 0) && (size <= 142606336)) {
 								spt = 17;
 								if (size <= 26738688)