MediaHTTP: add more null ptr and init checks

bug: 20912192
Change-Id: I83cf59ff85fd8aa3a19a696ceb97cd8aa922b8ba
diff --git a/media/libmedia/IMediaHTTPService.cpp b/media/libmedia/IMediaHTTPService.cpp
index f30d0f3..0c16a2b 100644
--- a/media/libmedia/IMediaHTTPService.cpp
+++ b/media/libmedia/IMediaHTTPService.cpp
@@ -44,6 +44,7 @@
         status_t err = reply.readInt32();
 
         if (err != OK) {
+            ALOGE("Unable to make HTTP connection (err = %d)", err);
             return NULL;
         }