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gunzip: the extra length field (XLEN) is two bytes instead of one

example file:
https://www.mirbsd.org/MirOS/dist/mir/mksh/mksh-R50f.tgz

--- a/sys/src/cmd/gzip/gunzip.c

+++ b/sys/src/cmd/gzip/gunzip.c

@@ -236,9 +236,12 @@

 	/* OS type */

 	get1(bin);

-	if(flag & GZFEXTRA)

-		for(i=get1(bin); i>0; i--)

+	if(flag & GZFEXTRA){

+		i = get1(bin);

+		i |= get1(bin)<<8;

+		for(; i>0; i--)

 			get1(bin);

+	}

 	/* name */

 	if(flag & GZFNAME){