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Avoids signed overflow in ectest random number generation.

--- a/libcelt/tests/ectest.c

+++ b/libcelt/tests/ectest.c

@@ -108,8 +108,8 @@

     unsigned tell_bits;

     int       j;

     int zeros;

-    ft=rand()/((RAND_MAX>>(rand()%11))+1)+10;

-    sz=rand()/((RAND_MAX>>(rand()%9))+1);

+    ft=rand()/((RAND_MAX>>(rand()%11U))+1U)+10;

+    sz=rand()/((RAND_MAX>>(rand()%9U))+1U);

     data=(unsigned *)malloc(sz*sizeof(*data));

     tell=(unsigned *)malloc((sz+1)*sizeof(*tell));

     ec_enc_init(&enc,ptr,DATA_SIZE2);

@@ -170,7 +170,7 @@

     unsigned *tell;

     unsigned *enc_method;

     int       j;

-    sz=rand()/((RAND_MAX>>(rand()%9))+1);

+    sz=rand()/((RAND_MAX>>(rand()%9U))+1U);

     logp1=(unsigned *)malloc(sz*sizeof(*logp1));

     data=(unsigned *)malloc(sz*sizeof(*data));

     tell=(unsigned *)malloc((sz+1)*sizeof(*tell));