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[tests] use constant for array size, include string.h

--- a/tests/utils_tests.h

+++ b/tests/utils_tests.h

@@ -5,6 +5,10 @@

 #include <assert.h>

 #include "config.h"

+#ifdef HAVE_STRING_H

+#include <string.h>

+#endif

+

 #ifdef HAVE_UNISTD_H

 #include <unistd.h> // unlink, close

 #endif

@@ -110,7 +114,8 @@

 int run_on_default_sink( int main(int, char**) )

 {

-  int argc = 2, err;

+  const int argc = 2;

+  int err = 0;

   char* argv[argc];

   char sink_path[PATH_MAX] = "tmp_aubio_XXXXXX";

   int fd = create_temp_sink(sink_path);