Avoid left-shift by 32 on int32 in ectest.

libcelt/entenc.c

@@ -195,6 +195,7 @@ void ec_enc_bits(ec_enc *_this,opus_uint32 _fl,unsigned _bits){
   int       used;
   window=_this->end_window;
   used=_this->nend_bits;
+  celt_assert(_bits>0);
   if(used+_bits>EC_WINDOW_SIZE){
     do{
       _this->error|=ec_write_byte_at_end(_this,(unsigned)window&EC_SYM_MAX);

libcelt/entenc.h

@@ -73,7 +73,7 @@ void ec_enc_uint(ec_enc *_this,opus_uint32 _fl,opus_uint32 _ft);
 /*Encodes a sequence of raw bits in the stream.
   _fl:  The bits to encode.
   _ftb: The number of bits to encode.
-        This must be between 0 and 25, inclusive.*/
+        This must be between 1 and 25, inclusive.*/
 void ec_enc_bits(ec_enc *_this,opus_uint32 _fl,unsigned _ftb);
 
 /*Overwrites a few bits at the very start of an existing stream, after they

libcelt/tests/ectest.c

@@ -55,7 +55,7 @@ int main(int _argc,char **_argv){
     }
   }
   /*Testing encoding of raw bit values.*/
-  for(ftb=0;ftb<16;ftb++){
+  for(ftb=1;ftb<16;ftb++){
     for(i=0;i<(1<<ftb);i++){
       entropy+=ftb;
       nbits=ec_tell(&enc);
@@ -84,7 +84,7 @@ int main(int _argc,char **_argv){
       }
     }
   }
-  for(ftb=0;ftb<16;ftb++){
+  for(ftb=1;ftb<16;ftb++){
     for(i=0;i<(1<<ftb);i++){
       sym=ec_dec_bits(&dec,ftb);
       if(sym!=(unsigned)i){