Description:
------------
There is a stack overflow inside imagefilltoborder.

Test script:
---------------
$im = imagecreatetruecolor(20, 20);
$c = imagecolorallocate($im, 255, 0, 0);
imagefilltoborder($im, 0, -999355, $c, $c);

Expected result:
----------------
Not crash/image

Actual result:
--------------
(13cc.e2c): Stack overflow - code c00000fd (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=00000000 ebx=fff4cb4b ecx=000f4240 edx=00000000 esi=00d9dca0 edi=ffffffff
eip=675cca19 esp=003d3000 ebp=003d3004 iopl=0         nv up ei ng nz ac pe cy
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00210297
*** WARNING: Unable to verify checksum for C:\php\php_gd2.dll
php_gd2!php_gd_gdImageSetPixel+0x9:
675cca19 57              push    edi
0:000> k
ChildEBP RetAddr  
003d3004 675cb829 php_gd2!php_gd_gdImageSetPixel+0x9 [c:\php-sdk\php55\vc11\x86\php-5.5.7\ext\gd\libgd\gd.c @ 723]
003d3034 675cb938 php_gd2!php_gd_gdImageFillToBorder+0x79 [c:\php-sdk\php55\vc11\x86\php-5.5.7\ext\gd\libgd\gd.c @ 1786]
003d3068 675cb938 php_gd2!php_gd_gdImageFillToBorder+0x188 [c:\php-sdk\php55\vc11\x86\php-5.5.7\ext\gd\libgd\gd.c @ 1827]
003d309c 675cb938 php_gd2!php_gd_gdImageFillToBorder+0x188 [c:\php-sdk\php55\vc11\x86\php-5.5.7\ext\gd\libgd\gd.c @ 1827]
003d30d0 675cb938 php_gd2!php_gd_gdImageFillToBorder+0x188 [c:\php-sdk\php55\vc11\x86\php-5.5.7\ext\gd\libgd\gd.c @ 1827]
003d3104 675cb938 php_gd2!php_gd_gdImageFillToBorder+0x188 [c:\php-sdk\php55\vc11\x86\php-5.5.7\ext\gd\libgd\gd.c @ 1827]
003d3138 675cb938 php_gd2!php_gd_gdImageFillToBorder+0x188 [c:\php-sdk\php55\vc11\x86\php-5.5.7\ext\gd\libgd\gd.c @ 1827]
003d316c 675cb938 php_gd2!php_gd_gdImageFillToBorder+0x188 [c:\php-sdk\php55\vc11\x86\php-5.5.7\ext\gd\libgd\gd.c @ 1827]
003d31a0 675cb938 php_gd2!php_gd_gdImageFillToBorder+0x188 [c:\php-sdk\php55\vc11\x86\php-5.5.7\ext\gd\libgd\gd.c @ 1827]
...