frameworks/base: Fix aliasing violations

Fix violations of strict aliasing rules

Change-Id: Ia83db6a0be18f52e8f274c581c3b42f031b39247
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
Possible leak in android_emoji_EmojiFactory_newInstance

jchars is not released correctly if factory is NULL.
In addition, unnecessary string conversion removed.

Change-Id: I3ea58391dfe7a96ea6d6ae61bb0867a2d8d49fb0

Conflicts:
	core/jni/android_emoji_EmojiFactory.cpp