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bzip2: use IOUNIT for transfer block size

--- a/sys/src/cmd/bzip2/bunzip2.c

+++ b/sys/src/cmd/bzip2/bunzip2.c

@@ -125,8 +125,8 @@

 bunzip(int ofd, char *ofile, Biobuf *bin)

 {

 	int e, n, done, onemore;

-	char buf[8192];

-	char obuf[8192];

+	char buf[IOUNIT];

+	char obuf[IOUNIT];

 	Biobuf bout;

 	bz_stream strm;

--- a/sys/src/cmd/bzip2/bzip2.c

+++ b/sys/src/cmd/bzip2/bzip2.c

@@ -132,8 +132,8 @@

 bzip(char *file, long mtime, int ifd, Biobuf *bout)

 {

 	int e, n, done, onemore;

-	char buf[8192];

-	char obuf[8192];

+	char buf[IOUNIT];

+	char obuf[IOUNIT];

 	Biobuf bin;

 	bz_stream strm;