avfilter/vf_hqx: Fix undefined left shifts of negative numbers

Affected every usage of this filter; in particular, it affected the
FATE-tests filter-2xbr, filter-3xbr and filter-4xbr.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit fa21194326)
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavfilter/vf_hqx.c

@@ -523,7 +523,7 @@ static av_cold int init(AVFilterContext *ctx)
             int startg = FFMAX3(-bg, -rg, 0);
             int endg = FFMIN3(255-bg, 255-rg, 255);
             uint32_t y = (uint32_t)(( 299*rg + 1000*startg + 114*bg)/1000);
-            c = bg + (rg<<16) + 0x010101 * startg;
+            c = bg + rg * (1 << 16) + 0x010101 * startg;
             for (g = startg; g <= endg; g++) {
                 hqx->rgbtoyuv[c] = ((y++) << 16) + (u << 8) + v;
                 c+= 0x010101;