FixedMessageQueue: Fix compile error and off-by-1
FixedMessageQueue: Fix compile error and off-by-1

microflo/microflo,microflo/microflo,microflo/microflo,microflo/microflo,microflo/microflo,rraallvv/microflo,rraallvv/microflo,rraallvv/microflo,microflo/microflo,rraallvv/microflo