Make vdc a C++ file as a base for further improvement.

Bug: 19704432
Change-Id: I784e8a91d3b0f4d6cd0dc668e9e55d0290f768e8

Android.mk

@@ -98,7 +98,7 @@ include $(CLEAR_VARS)
 
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 LOCAL_CLANG := true
-LOCAL_SRC_FILES:= vdc.c
+LOCAL_SRC_FILES:= vdc.cpp
 LOCAL_MODULE:= vdc
 LOCAL_SHARED_LIBRARIES := libcutils
 LOCAL_CFLAGS := $(vold_cflags)

vdc.cpp

@@ -100,7 +100,7 @@ static int do_cmd(int sock, int argc, char **argv) {
 }
 
 static int do_monitor(int sock, int stop_after_cmd) {
-    char *buffer = malloc(4096);
+    char *buffer = (char *) malloc(4096);
 
     if (!stop_after_cmd)
         printf("[Connected to Vold]\n");