Fix surround encoding

Broken by 306d7f5a308e30ce10ba1a1dcdbeeb81de3b2872
diff --git a/src/opus_multistream_encoder.c b/src/opus_multistream_encoder.c
index d6db70f..6e52a4d 100644
--- a/src/opus_multistream_encoder.c
+++ b/src/opus_multistream_encoder.c
@@ -267,7 +267,7 @@
             freq[i] = 0;
       }
 
-      compute_band_energies(celt_mode, freq, bandE, 21, 1, 1<<LM);
+      compute_band_energies(celt_mode, freq, bandE, 21, 1, LM);
       amp2Log2(celt_mode, 21, 21, bandE, bandLogE+21*c, 1);
       /* Apply spreading function with -6 dB/band going up and -12 dB/band going down. */
       for (i=1;i<21;i++)