[PATCH]sgio2audio.c: clean up checking

["Figo.zhang" <figo1802@xxxxxxxxx>]

vfree() does it's own 'NULL' check,so no need for check before
calling it.

Signed-off-by: Figo.zhang <figo1802@xxxxxxxxx>
---  
 sound/mips/sgio2audio.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/sound/mips/sgio2audio.c b/sound/mips/sgio2audio.c
index 66f3b48..e497525 100644
--- a/sound/mips/sgio2audio.c
+++ b/sound/mips/sgio2audio.c
@@ -619,8 +619,7 @@ static int snd_sgio2audio_pcm_hw_params(struct snd_pcm_substream *substream,
 /* hw_free callback */
 static int snd_sgio2audio_pcm_hw_free(struct snd_pcm_substream *substream)
 {
-	if (substream->runtime->dma_area)
-		vfree(substream->runtime->dma_area);
+	vfree(substream->runtime->dma_area);
 	substream->runtime->dma_area = NULL;
 	return 0;
 }


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