change pml_size to a signed type to flag the error checking already present but which would never work previously from delving into negative values
change pml_size to a signed type to flag the error checking already present but which would never work previously from delving into negative values

git-svn-id: f2acecaac6fbd5a03f3d4799db58dda434111981@5313 3eda493b-6a19-0410-b2e0-ec8ea4dd8fda

pscedu/pfl,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/pfl,pscedu/slash2-stable,pscedu/pfl,pscedu/pfl