Compiler warnings in dispnew.c

[Po Lu <luangruo@yahoo.com>]

Building with checking, I get:

  CC       dispnew.o
In function ‘copy_row_except_pointers’,
    inlined from ‘assign_row’ at dispnew.c:1050:3,
    inlined from ‘mirror_make_current’ at dispnew.c:2761:3:
dispnew.c:1037:3: warning: ‘memcpy’ offset [48, 255] from the object at ‘current_row’ is out of the bounds of referenced subobject ‘x’ with type ‘int’ at offset 44 [-Warray-bounds]
 1037 |   memcpy (&to->x, &from->x, sizeof *to - off);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from termchar.h:23,
                 from dispnew.c:28:
dispnew.c: In function ‘mirror_make_current’:
dispextern.h:885:7: note: subobject ‘x’ declared here
  885 |   int x, y;
      |       ^
In function ‘copy_row_except_pointers’,
    inlined from ‘assign_row’ at dispnew.c:1050:3,
    inlined from ‘make_current’ at dispnew.c:2719:3:
dispnew.c:1037:3: warning: ‘memcpy’ offset [48, 255] from the object at ‘current_row’ is out of the bounds of referenced subobject ‘x’ with type ‘int’ at offset 44 [-Warray-bounds]
 1037 |   memcpy (&to->x, &from->x, sizeof *to - off);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from termchar.h:23,
                 from dispnew.c:28:
dispnew.c: In function ‘make_current’:
dispextern.h:885:7: note: subobject ‘x’ declared here
  885 |   int x, y;
      |       ^
In function ‘copy_row_except_pointers’,
    inlined from ‘assign_row’ at dispnew.c:1050:3,
    inlined from ‘scrolling_window’ at dispnew.c:4445:4,
    inlined from ‘update_window’ at dispnew.c:3651:13:
dispnew.c:1037:3: warning: ‘memcpy’ offset [48, 255] from the object at ‘c’ is out of the bounds of referenced subobject ‘x’ with type ‘int’ at offset 44 [-Warray-bounds]
 1037 |   memcpy (&to->x, &from->x, sizeof *to - off);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from termchar.h:23,
                 from dispnew.c:28:
dispnew.c: In function ‘update_window’:
dispextern.h:885:7: note: subobject ‘x’ declared here
  885 |   int x, y;
      |       ^
In function ‘copy_row_except_pointers’,
    inlined from ‘assign_row’ at dispnew.c:1050:3,
    inlined from ‘scrolling_window’ at dispnew.c:4768:6,
    inlined from ‘update_window’ at dispnew.c:3651:13:
dispnew.c:1037:3: warning: ‘memcpy’ offset [48, 255] from the object at ‘to’ is out of the bounds of referenced subobject ‘x’ with type ‘int’ at offset 44 [-Warray-bounds]
 1037 |   memcpy (&to->x, &from->x, sizeof *to - off);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from termchar.h:23,
                 from dispnew.c:28:
dispnew.c: In function ‘update_window’:
dispextern.h:885:7: note: subobject ‘x’ declared here
  885 |   int x, y;

I think it would be prudent to fix this, thanks.