decoder: return early when the object type can't be supported (#233)

No need to allocate a filter bank that will not be used (and may leak).

Author: robUx4

libfaad/decoder.c

@@ -372,6 +372,9 @@ long NeAACDecInit(NeAACDecHandle hpDecoder,
     }
 #endif
 
+    if (can_decode_ot(hDecoder->object_type) < 0)
+        return -1;
+
     /* must be done before frameLength is divided by 2 for LD */
 #ifdef SSR_DEC
     if (hDecoder->object_type == SSR)
@@ -385,9 +388,6 @@ long NeAACDecInit(NeAACDecHandle hpDecoder,
         hDecoder->frameLength >>= 1;
 #endif
 
-    if (can_decode_ot(hDecoder->object_type) < 0)
-        return -1;
-
     return bits;
 }