Unconditional delete

Don't check that pointer is non-NULL before delete.

Don't leave deleted member fields non-NULL, except in a destructor,
since it could be misleading in a dump or debugger. (mRsmpOutBuffer)

Change-Id: Ic0492a6b752f74a67f4c96dfb89ca2de4e69eecf
diff --git a/services/audioflinger/AudioMixer.cpp b/services/audioflinger/AudioMixer.cpp
index a8102e5..a01c6a8 100644
--- a/services/audioflinger/AudioMixer.cpp
+++ b/services/audioflinger/AudioMixer.cpp
@@ -1127,9 +1127,7 @@
         }
     }
 
-    if (buff != NULL) {
-        delete [] buff;
-    }
+    delete [] buff;
 }
 #endif