Don't use sp<>&

because they may end up pointing to NULL after a NULL check was performed.

Bug: 28166152
Change-Id: Iab2ea30395b620628cc6f3d067dd4f6fcda824fe
diff --git a/media/libmedia/mediaplayer.cpp b/media/libmedia/mediaplayer.cpp
index 2795101..adc267a 100644
--- a/media/libmedia/mediaplayer.cpp
+++ b/media/libmedia/mediaplayer.cpp
@@ -152,7 +152,7 @@
     ALOGV("setDataSource(%s)", url);
     status_t err = BAD_VALUE;
     if (url != NULL) {
-        const sp<IMediaPlayerService>& service(getMediaPlayerService());
+        const sp<IMediaPlayerService> service(getMediaPlayerService());
         if (service != 0) {
             sp<IMediaPlayer> player(service->create(this, mAudioSessionId));
             if ((NO_ERROR != doSetRetransmitEndpoint(player)) ||
@@ -169,7 +169,7 @@
 {
     ALOGV("setDataSource(%d, %" PRId64 ", %" PRId64 ")", fd, offset, length);
     status_t err = UNKNOWN_ERROR;
-    const sp<IMediaPlayerService>& service(getMediaPlayerService());
+    const sp<IMediaPlayerService> service(getMediaPlayerService());
     if (service != 0) {
         sp<IMediaPlayer> player(service->create(this, mAudioSessionId));
         if ((NO_ERROR != doSetRetransmitEndpoint(player)) ||
@@ -185,7 +185,7 @@
 {
     ALOGV("setDataSource(IDataSource)");
     status_t err = UNKNOWN_ERROR;
-    const sp<IMediaPlayerService>& service(getMediaPlayerService());
+    const sp<IMediaPlayerService> service(getMediaPlayerService());
     if (service != 0) {
         sp<IMediaPlayer> player(service->create(this, mAudioSessionId));
         if ((NO_ERROR != doSetRetransmitEndpoint(player)) ||