ffplay: crash with rawvideo avi on windows

[ami_stuff]

attached file crashes ffplay on windows (have no debug build atm)

could be regression related to sdl -> sld2 switch

C:\>d:\ffplay d:\640.avi
ffplay version N-82324-g872b358 Copyright (c) 2003-2016 the FFmpeg developers
  built with gcc 5.4.0 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dx
va2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-lib
ebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --ena
ble-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfree
type --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enab
le-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-lib
openh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschr
oedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheor
a --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvo
rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --ena
ble-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --e
nable-decklink --enable-zlib
  libavutil      55. 36.100 / 55. 36.100
  libavcodec     57. 66.101 / 57. 66.101
  libavformat    57. 57.100 / 57. 57.100
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 66.100 /  6. 66.100
  libswscale      4.  3.100 /  4.  3.100
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
Input #0, avi, from 'd:\640.avi':
  Duration: 00:00:00.08, start: 0.000000, bitrate: 117989 kb/s
    Stream #0:0: Video: rawvideo, bgra, 640x480, 12 fps, 12 tbr, 12 tbn, 12 tbc
    nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0

[Marton Balint]

Lovely, negative linesize... Will send a patch soon.

[Marton Balint]

Fixed in 58af48f1c3cc98afc1f25d494f197148801cf210.