Don't depend on String8 cast to C string

Bug: 295394788
Test: m checkbuild
Change-Id: I6aa039b6b2a4944e3537ef133f8785890d957edd
diff --git a/media/jni/android_media_MediaPlayer.cpp b/media/jni/android_media_MediaPlayer.cpp
index 43de378..febaba9 100644
--- a/media/jni/android_media_MediaPlayer.cpp
+++ b/media/jni/android_media_MediaPlayer.cpp
@@ -260,7 +260,7 @@
     status_t opStatus =
         mp->setDataSource(
                 httpService,
-                pathStr,
+                pathStr.c_str(),
                 headersVector.size() > 0? &headersVector : NULL);
 
     process_media_player_call(