Maybe fix the Windows segfault when firing at out-of-view monsters

catacurse.cpp

@@ -157,6 +157,7 @@ inline void FillRectDIB(int x, int y, int width, int height, unsigned char color
{
    int j;
    for (j=y; j<y+height; j++)
        //NOTE TO FUTURE: this breaks if j is negative. Apparently it doesn't break if j is too large, though?
        memset(&dcbits[x+j*WindowWidth],color,width);
};

@@ -331,6 +332,10 @@ fin.open("data\\FONTDATA");

WINDOW *newwin(int nlines, int ncols, int begin_y, int begin_x)
{
    if (begin_y < 0 || begin_x < 0) {
        return NULL; //it's the caller's problem now (since they have logging functions declared)
    }

    int i,j;
    WINDOW *newwindow = new WINDOW;
    //newwindow=&_windows[WindowCount];

output.cpp

@@ -931,7 +931,11 @@ void draw_tab(WINDOW *w, int iOffsetX, std::string sText, bool bSelected)

void hit_animation(int iX, int iY, nc_color cColor, char cTile, int iTimeout)
{
/*    WINDOW *w_hit = newwin(1, 1, iY+VIEW_OFFSET_Y, iX+VIEW_OFFSET_X);
    WINDOW *w_hit = newwin(1, 1, iY+VIEW_OFFSET_Y, iX+VIEW_OFFSET_X);
    if (w_hit == NULL) {
        return; //we passed in negative values (semi-expected), so let's not segfault
    }

    mvwputch(w_hit, 0, 0, cColor, cTile);
    wrefresh(w_hit);