dr_81: revert previous patch, use calloc instead

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>

src/descriptors/dr_81.c

@@ -59,12 +59,10 @@ dvbpsi_ac3_audio_dr_t *dvbpsi_DecodeAc3AudioDr(dvbpsi_descriptor_t *p_descriptor
     if (p_descriptor->i_length < 3)
         return NULL;
 
-    p_decoded = (dvbpsi_ac3_audio_dr_t*)malloc(sizeof(dvbpsi_ac3_audio_dr_t));
+    p_decoded = (dvbpsi_ac3_audio_dr_t*)calloc(1, sizeof(dvbpsi_ac3_audio_dr_t));
     if (!p_decoded)
         return NULL;
 
-    memset(p_decoded, 0, sizeof (dvbpsi_ac3_audio_dr_t));
-
     p_descriptor->p_decoded = (void*)p_decoded;
 
     p_decoded->i_sample_rate_code = 0x07 & (buf[0] >> 5);