AudioPolicyService: malloc/delete pair

Change-Id: I75cd44ac0caccda9148faaa052c9e7a0c06d46d1
Signed-off-by: You Kim <you.kim72@gmail.com>
diff --git a/services/audioflinger/AudioPolicyService.cpp b/services/audioflinger/AudioPolicyService.cpp
index 2706880..3904514 100644
--- a/services/audioflinger/AudioPolicyService.cpp
+++ b/services/audioflinger/AudioPolicyService.cpp
@@ -1206,7 +1206,7 @@
     return fx_param;
 
 error:
-    delete fx_param;
+    free(fx_param);
     return NULL;
 }