C++17 compatibility: remove unreachable return.

Bug: http://b/111067277
Test: builds
Change-Id: If6c3a4add1721067965e19599a7649cc21b55619
diff --git a/runtime/dex_to_dex_decompiler.cc b/runtime/dex_to_dex_decompiler.cc
index a5248e6..aff9b47 100644
--- a/runtime/dex_to_dex_decompiler.cc
+++ b/runtime/dex_to_dex_decompiler.cc
@@ -187,7 +187,6 @@
       LOG(FATAL) << "Failed to use all values in quickening info."
                  << " Actual: " << std::hex << quicken_index_
                  << " Expected: " << quicken_info_.NumIndices();
-      return false;
     }
   }