Disable -Wimplicit-fallthrough unless src is fixed.

* Current -Wno-error=implicit-fallthrough caused
  clang-tidy assertion fault, see
  https://bugs.llvm.org/show_bug.cgi?id=39312
* We could enable this warning when source file is fixed.

Bug: 117780134
Test: build with WITH_TIDY=1
Change-Id: I5e2c4b01dc11299e136b81f4ee3d817aa04c71cb
diff --git a/msm8998/ipacm/src/Android.mk b/msm8998/ipacm/src/Android.mk
index f569c35..57097c9 100644
--- a/msm8998/ipacm/src/Android.mk
+++ b/msm8998/ipacm/src/Android.mk
@@ -52,7 +52,7 @@
         -Wno-writable-strings \
 
 # Allow implicit fallthroughs in IPACM_Main.cpp until they are fixed.
-LOCAL_CFLAGS += -Wno-error=implicit-fallthrough
+LOCAL_CFLAGS += -Wno-implicit-fallthrough
 
 LOCAL_SRC_FILES := IPACM_Main.cpp \
 		IPACM_EvtDispatcher.cpp \