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tests/src/utils/: improve examples

--- a/tests/src/utils/test-hist.c

+++ b/tests/src/utils/test-hist.c

@@ -1,9 +1,8 @@

 #define AUBIO_UNSTABLE 1

 #include <aubio.h>

-#include <stdlib.h>

-int main( )

+int main ()

 {

   uint_t length;

   for (length = 1; length < 10; length ++ ) {

--- a/tests/src/utils/test-scale.c

+++ b/tests/src/utils/test-scale.c

@@ -2,21 +2,21 @@

 #include <aubio.h>

-int main(){

-        /* allocate some memory */

-        uint_t win_s      = 1024;                       /* window size */

-        fvec_t * in       = new_fvec (win_s); /* input buffer */

-        aubio_scale_t * o = new_aubio_scale(0,1,2,3);

-        aubio_scale_set_limits (o,0,1,2,3);

-        uint_t i = 0;

+int main ()

+{

+  uint_t n = 0;

+  uint_t win_s = 1024; // window size

+  fvec_t * in = new_fvec (win_s); // input buffer

+  aubio_scale_t * o = new_aubio_scale(0,1,2,3);

+  aubio_scale_set_limits (o,0,1,2,3);

-        while (i < 1000) {

-          aubio_scale_do(o,in);

-          i++;

-        };

+  while (n < 1000) {

+    aubio_scale_do(o,in);

+    n++;

+  };

-        del_aubio_scale(o);

-        del_fvec(in);

+  del_aubio_scale(o);

+  del_fvec(in);

-        return 0;

+  return 0;

 }