Fixed clang warnings

Author: sadko4u

src/test/ptest/demo/trig.cpp

@@ -63,7 +63,7 @@ PTEST_BEGIN("demo", trig, 2.0, 10000)
             return;
 
         char buf[80];
-        sprintf(buf, "%s x %d", label, int(count));
+        snprintf(buf, sizeof(buf), "%s x %d", label, int(count));
         printf("Testing %s numbers...\n", buf);
 
         PTEST_LOOP(buf,