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ivf2raw: print short read offset

--- a/extra/ivf2raw.c

+++ b/extra/ivf2raw.c

@@ -102,7 +102,7 @@

 	bufsz = 0;

 	buf = nil;

 	for(framenum = 0;; framenum++){

-		if(Bu32le(&in, &sz) < 0 || Bu64le(&in, &timestamp) || (int)sz < 0)

+		if(Bu32le(&in, &sz) < 0 || Bu64le(&in, &timestamp) < 0 || (int)sz < 0)

 			break;

 		if(bufsz < sz){

 			bufsz = sz;

@@ -110,7 +110,7 @@

 				sysfatal("frame %llud is too big: %d bytes", framenum, bufsz);

 		}

 		if((n = Bread(&in, buf, sz)) != sz)

-			sysfatal("short read (%d < %d)", n, sz);

+			sysfatal("short read (%d < %d) at %lld", n, sz, Boffset(&in));

 		if(hxsz < 1)

 			Bwrite(&out, buf, sz);

 		else