[Patch] media/BufferConsumer.cpp: Fix ordered comparison between pointer and zero

[mt]

Since 'group' is pointer, I think comparison at line 272 may be replaced to null pointer check.

​http://cgit.haiku-os.org/haiku/tree/src/kits/media/BufferConsumer.cpp#n272

/home/haiku/haiku/haiku/src/kits/media/BufferConsumer.cpp:272:12: error: ordered comparison between pointer and zero ('BBufferGroup *' and 'int')
        if (group > 0) {
            ~~~~~ ^ ~

[korli]

Introduced here, but was present since 2002: ​http://cgit.haiku-os.org/haiku/commit/src/kits/media/BufferConsumer.cpp?id=0341eac71b9b939a8053c2fb5925c63814114965

Patch LGTM.

[pulkomandy]

Applied in hrev51281. Thanks!