Enable fsanitize unsigned-integer-overflow in rtsp

Change-Id: Ie8569394461f4f2d89b9ec5b7cfe34bc28056471
diff --git a/media/libstagefright/rtsp/Android.mk b/media/libstagefright/rtsp/Android.mk
index c5e8c35..8bcb29e 100644
--- a/media/libstagefright/rtsp/Android.mk
+++ b/media/libstagefright/rtsp/Android.mk
@@ -33,6 +33,7 @@
 
 LOCAL_CFLAGS += -Werror -Wall
 LOCAL_CLANG := true
+LOCAL_SANITIZE := unsigned-integer-overflow
 
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk