083 make variable filesize as size in bytes

The first argument of _scratch_mkfs_sized() should be file system size
in bytes, so '100m' is not a valid number, and the 'expr' expression in
_scratch_mkfs_sized() complains 'non-numeric argument' about it.

Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

083

@@ -91,7 +91,7 @@ workout()
 
 echo "*** test out-of-space handling for random write operations"
 
-filesize=100m
+filesize=`expr 100 \* 1024 \* 1024`
 agcount=6
 numprocs=15
 numops=1500