theora: fix comment

modules/codec/theora.c

@@ -656,7 +656,7 @@ static int OpenEncoder( vlc_object_t *p_this )
         return VLC_EGENERIC;
     }
 
-    /* Allocate the memory needed to store the decoder's structure */
+    /* Allocate the memory needed to store the encoder's structure */
     if( ( p_sys = malloc(sizeof(encoder_sys_t)) ) == NULL )
         return VLC_ENOMEM;
     p_enc->p_sys = p_sys;