Many changes to reduce complaints from CppCheck. Several latent bugs fixes, but probably some new typos introduced

libc/audio/lib_buffer.c

@@ -138,7 +138,7 @@ int apb_alloc(FAR struct audio_buf_desc_s *bufdesc)
     {
       /* Populate the buffer contents */
 
-      memset(pBuf, bufsize, 0);
+      memset(pBuf, 0, bufsize);
       pBuf->i.channels = 1;
       pBuf->crefs = 1;
       pBuf->nmaxbytes = bufdesc->numbytes;

libc/time/lib_isleapyear.c

@@ -83,6 +83,6 @@
 
 int clock_isleapyear(int year)
 {
-  return year % 400 ? (year % 100 ? (year % 4 ? 0 : 1) : 0) : 1;
+  return (year % 400) ? ((year % 100) ? ((year % 4) ? 0 : 1) : 0) : 1;
 }