firefox/firefox-70.0-fix-__warn_memset_zero_len.patch

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--- mozilla-release-FIREFOX_70_0_RELEASE/media/ffvpx/libavcodec/utils.c.orig 2019-10-31 09:15:24.819410877 +0100
+++ mozilla-release-FIREFOX_70_0_RELEASE/media/ffvpx/libavcodec/utils.c 2019-10-31 09:13:52.736038110 +0100
@@ -421,7 +421,7 @@
if (desc->comp[0].depth >= 9) {
for (x = 0; x<bytes; x++)
((uint16_t*)dst)[x] = c[p];
- }else
+ }else if (bytes>0)
memset(dst, c[p], bytes);
dst += frame->linesize[p];
}