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treat an ANMF chunk containing multiple VP8/VP8L file as malformed. fixes a WebPMuxImage::img_ leak. Though the invalid free in #9106 was avoided in (ubsan): be738c6d muxread,ChunkVerifyAndAssign: validate chunk_size that file would still cause a leak similar to #9099. BUG=oss-fuzz:9099,oss-fuzz:9106 Change-Id: Ib873446a1188afeeb2fe5d53a86b75e0c5de9573 (cherry picked from commit eb82ce76ddca13ad6fb13376bb58b9fd3f850e9e)