Fix an incorrect && with kTraceCountAllocs flag.

The latest Clang warns on this particular use of a constant flag with
logical operators. It looks like this:

error: use of logical '&&' with constant operand [-Werror,-Wconstant-logical-operand]

Test: Build art
Change-Id: If1635e8f02ac6ef438dbef201053973e5012b04c
1 file changed