vp6: partially propagate huffman tree building errors during coeff model parsing and fix misspelling

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
(cherry picked from commit f913eeea43078b3b9052efd8d8d29e7b29b39208)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
diff --git a/libavcodec/vp6.c b/libavcodec/vp6.c
index 0b26c04..d05a361 100644
--- a/libavcodec/vp6.c
+++ b/libavcodec/vp6.c
@@ -213,8 +213,8 @@
     return (a->count - b->count)*16 + (b->sym - a->sym);
 }
 
-static void vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[],
-                                const uint8_t *map, unsigned size, VLC *vlc)
+static int vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[],
+                               const uint8_t *map, unsigned size, VLC *vlc)
 {
     Node nodes[2*VP6_MAX_HUFF_SIZE], *tmp = &nodes[size];
     int a, b, i;
@@ -229,9 +229,9 @@
     }
 
     free_vlc(vlc);
-    /* then build the huffman tree accodring to probabilities */
-    ff_huff_build_tree(s->avctx, vlc, size, nodes, vp6_huff_cmp,
-                       FF_HUFFMAN_FLAG_HNODE_FIRST);
+    /* then build the huffman tree according to probabilities */
+    return ff_huff_build_tree(s->avctx, vlc, size, nodes, vp6_huff_cmp,
+                              FF_HUFFMAN_FLAG_HNODE_FIRST);
 }
 
 static int vp6_parse_coeff_models(VP56Context *s)