mux: ensure # images = # tiles
mux: ensure # images = # tiles

when a file contains tiles an image outside of a tile is not allowed.

Change-Id: I5d16759abc9aa9bb299103b2cd7d694fc9c89697

Distrotech/libwebp,ericmckean/webm.libwebp,altogother/webm.libwebp,yohunl/libwebp,matanbs/webm.libwebp,PKRoma/libwebp,redengineer/libwebp,ericmckean/webm.libwebp,redengineer/libwebp,Maria1099/webm.libwebp,imazen/libwebp,comoyo/gonzo-libwebp,rxl194/libwebp,altogother/webm.libwebp,rxl194/libwebp,Tekserve/libwebp,yohunl/libwebp,Suvarna1488/webm.libwebp,ya7lelkom/libwebp,gshORTON/webm.libwebp,jiehu5114/libwebp,kim42083/webm.libwebp,yohunl/libwebp,iniwf/webm.libwebp,Suvarna1488/webm.libwebp,ttyangf/libwebp,PKRoma/libwebp,matanbs/webm.libwebp,cysp/libwebp,PKRoma/libwebp,Maria1099/webm.libwebp,zofuthan/libwebp,Tekserve/libwebp,matanbs/webm.libwebp,appunite/libwebp,imazen/libwebp,gshORTON/webm.libwebp,jiehu5114/libwebp,kleopatra999/webm.libwebp,comoyo/gonzo-libwebp,zofuthan/libwebp,Aexyn/libwebp,keane83/BLE_IM,yohunl/libwebp,kim42083/webm.libwebp,kleopatra999/webm.libwebp,Maria1099/webm.libwebp,abwiz0086/webm.libwebp,redengineer/libwebp,Suvarna1488/webm.libwebp,Maria1099/webm.libwebp,reimaginemedia/webm.libwebp,Distrotech/libwebp,dumganhar/libwebp,kim42083/webm.libwebp,cysp/libwebp,Acidburn0zzz/webm.libwebp,ericmckean/webm.libwebp,gshORTON/webm.libwebp,jacklicn/libwebp,jacklicn/libwebp,webmproject/libwebp,ya7lelkom/libwebp,redengineer/libwebp,kleopatra999/webm.libwebp,kim42083/webm.libwebp,Suvarna1488/webm.libwebp,ya7lelkom/libwebp,gshORTON/webm.libwebp,Acidburn0zzz/webm.libwebp,keane83/BLE_IM,imazen/libwebp,appunite/libwebp,Tekserve/libwebp,jiehu5114/libwebp,cysp/libwebp,kleopatra999/webm.libwebp,ericmckean/webm.libwebp,jacklicn/libwebp,comoyo/gonzo-libwebp,jiehu5114/libwebp,ya7lelkom/libwebp,zofuthan/libwebp,ttyangf/libwebp,jacklicn/libwebp,keane83/BLE_IM,Suvarna1488/webm.libwebp,zofuthan/libwebp,ttyangf/libwebp,altogother/webm.libwebp,PKRoma/libwebp,kalli123/webm.libwebp,dumganhar/libwebp,kim42083/webm.libwebp,keane83/BLE_IM,appunite/libwebp,kalli123/webm.libwebp,abwiz0086/webm.libwebp,Acidburn0zzz/webm.libwebp,Aexyn/libwebp,webmproject/libwebp,abwiz0086/webm.libwebp,keane83/BLE_IM,abwiz0086/webm.libwebp,reimaginemedia/webm.libwebp,kalli123/webm.libwebp,rxl194/libwebp,kalli123/webm.libwebp,reimaginemedia/webm.libwebp,Aexyn/libwebp,gshORTON/webm.libwebp,jacklicn/libwebp,ttyangf/libwebp,appunite/libwebp,imazen/libwebp,iniwf/webm.libwebp,ericmckean/webm.libwebp,comoyo/gonzo-libwebp,comoyo/gonzo-libwebp,ya7lelkom/libwebp,Acidburn0zzz/webm.libwebp,Tekserve/libwebp,webmproject/libwebp,comoyo/gonzo-libwebp,imazen/libwebp,PKRoma/libwebp,jiehu5114/libwebp,Aexyn/libwebp,ttyangf/libwebp,iniwf/webm.libwebp,reimaginemedia/webm.libwebp,redengineer/libwebp,dumganhar/libwebp,cysp/libwebp,zofuthan/libwebp,kleopatra999/webm.libwebp,Acidburn0zzz/webm.libwebp,rxl194/libwebp,reimaginemedia/webm.libwebp,abwiz0086/webm.libwebp,kalli123/webm.libwebp,matanbs/webm.libwebp,Maria1099/webm.libwebp,matanbs/webm.libwebp,Distrotech/libwebp,PKRoma/libwebp,iniwf/webm.libwebp,webmproject/libwebp,altogother/webm.libwebp,yohunl/libwebp,iniwf/webm.libwebp,appunite/libwebp,Aexyn/libwebp,altogother/webm.libwebp,webmproject/libwebp,rxl194/libwebp,appunite/libwebp,comoyo/gonzo-libwebp