Fixed a bug that was introduced in the previous revision: the script entered an infinite loop when the size specified through -s was smaller than 64MB.

git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@932 d57e44dd-8a1f-0410-8b47-8ef2f437770f

scripts/blockdev-perftest

@@ -171,6 +171,7 @@ log2_blocksize=${log2_max_blocksize}
 while [ ! $log2_blocksize -lt $log2_min_blocksize ]
 do
   if [ $log2_blocksize -gt $log2_io_size ]; then
+    log2_blocksize=$((log2_blocksize - 1))
     continue
   fi
   iosize=$(pow2 $log2_io_size)