afl-fuzz: Fix invalid return

This crash was found by running afl-fuzz. When a semicolon is found, the
compiler assumes that there must be a 'return' keyword followed by a space.
This change handles the case where this assumption is not true.

Bug: None
Test: make tests
Change-Id: Ib572459b80e62acb11313801f8c062cfb2be9baf
2 files changed