Silence a memory leak warning from the static analyzer

The analyzer assumes that the given `put` operation may fail. This
shouldn't be the case, so mark it with a LOG_ALWAYS_FATAL_IF. Doing so
silences a warning about potential memory leaks originating from
TessellationCache::getRoundRect.

Bug: 27101951
Test: mma. Warning is gone.
Change-Id: I3adeacd6c2c9c03caecd989e2a1267c51e8ef905