Moved LFS_TRACE calls to API wrapper functions

This removes quite a bit of extra code needed to entertwine the
LFS_TRACE calls into the original funcions.

Also changed temporary return type to match API declaration where
necessary.

lfs_util.h

@@ -43,6 +43,7 @@ extern "C"
 {
 #endif
 
+
 // Macros, may be replaced by system specific wrappers. Arguments to these
 // macros must not have side-effects as the macros can be removed for a smaller
 // code footprint