Reduce fuzzer size of output TestOperand buffer

This change reduces the size of the TestOperand's buffer by taking the
modulus of the max size. This was previously done for creating
TestOperands with random data, but this change also reduces the size
for non-randomzied output data as well.

Bug: N/A
Test: mma
Change-Id: I977d3dc11bf26cb6376769afc6cede1eefae7b81
1 file changed