1gd/1gD may hangs up forever ...... Bug?

```c
int main()
{
  char *a = "NOT NULL";
  if(a)
  {
    char *b = a;
    printf("%s\n", b);
  }
  else
  {
    char *b = "NULL";
    printf("%s\n", b);
  }

  return 0;
}
```
When I input "1gd" or "1gD" on "b" variable inside the else block, gVim will hanging up until input Ctrl+C ... :(
