Revert "Fix memory leaks"

This reverts commit c5e90fe489f26680d64ef7df5a9c099affbbacb4.
diff --git a/media/libstagefright/MPEG4Extractor.cpp b/media/libstagefright/MPEG4Extractor.cpp
index 2037923..1f59e3a 100644
--- a/media/libstagefright/MPEG4Extractor.cpp
+++ b/media/libstagefright/MPEG4Extractor.cpp
@@ -4487,8 +4487,6 @@
         }
         if (size > mBuffer->size()) {
             ALOGE("buffer too small: %zu > %zu", size, mBuffer->size());
-            mBuffer->release();
-            mBuffer = NULL;
             return ERROR_BUFFER_TOO_SMALL;
         }
     }
@@ -4781,8 +4779,6 @@
         }
         if (size > mBuffer->size()) {
             ALOGE("buffer too small: %zu > %zu", size, mBuffer->size());
-            mBuffer->release();
-            mBuffer = NULL;
             return ERROR_BUFFER_TOO_SMALL;
         }
     }