gpu: ion: Don't call ion_buffer_put on error path

If dma_buf_fd fails, the dma_buf needs to be cleaned up by
calling dma_buf_put. dma_buf_put will call ion_dma_buf_release
which in turn calls ion_buffer_put to clean up the buffer
reference. Calling ion_buffer_put after dma_buf_put drops the
reference count by one more which is incorrect. Fix this by
getting rid of the extra ion_buffer_put call.
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
[jstultz: modified patch to apply to staging directory]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/android/ion/ion.c

@@ -925,10 +925,9 @@ int ion_share_dma_buf(struct ion_client *client, struct ion_handle *handle)
 		return PTR_ERR(dmabuf);
 	}
 	fd = dma_buf_fd(dmabuf, O_CLOEXEC);
-	if (fd < 0) {
+	if (fd < 0)
 		dma_buf_put(dmabuf);
-		ion_buffer_put(buffer);
-	}
+
 	return fd;
 }
 EXPORT_SYMBOL(ion_share_dma_buf);