Fix FTBFS with GCC6

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

mpeglib/lib/splay/huffmantable.cpp

@@ -547,11 +547,11 @@ htd33[ 31][2]={{ 16,  1},{  8,  1},{  4,  1},{  2,  1},{  0,  0},{  0,  1},
 
 const ATTR_ALIGN(64) HUFFMANCODETABLE Mpegtoraw::ht[HTN]=
 {
-  { 0, 0-1, 0-1, 0,  0, htd33},
+  { 0, (unsigned)(0-1), (unsigned)(0-1), 0,  0, htd33},
   { 1, 2-1, 2-1, 0,  7,htd01},
   { 2, 3-1, 3-1, 0, 17,htd02},
   { 3, 3-1, 3-1, 0, 17,htd03},
-  { 4, 0-1, 0-1, 0,  0, htd33},
+  { 4, (unsigned)(0-1), (unsigned)(0-1), 0,  0, htd33},
   { 5, 4-1, 4-1, 0, 31,htd05},
   { 6, 4-1, 4-1, 0, 31,htd06},
   { 7, 6-1, 6-1, 0, 71,htd07},
@@ -561,7 +561,7 @@ const ATTR_ALIGN(64) HUFFMANCODETABLE Mpegtoraw::ht[HTN]=
   {11, 8-1, 8-1, 0,127,htd11},
   {12, 8-1, 8-1, 0,127,htd12},
   {13,16-1,16-1, 0,511,htd13},
-  {14, 0-1, 0-1, 0,  0, htd33},
+  {14, (unsigned)(0-1), (unsigned)(0-1), 0,  0, htd33},
   {15,16-1,16-1, 0,511,htd15},
   {16,16-1,16-1, 1,511,htd16},
   {17,16-1,16-1, 2,511,htd16},