libroot: sync() should not return any value

headers/posix/unistd.h

@@ -189,7 +189,7 @@ extern ssize_t  write_pos(int fd, off_t pos, const void *buffer,size_t count);
 extern ssize_t	pwrite(int fd, const void *buffer, size_t count, off_t pos);
 extern off_t	lseek(int fd, off_t offset, int whence);
 
-extern int		sync(void);
+extern void		sync(void);
 extern int		fsync(int fd);
 
 extern int		chown(const char *path, uid_t owner, gid_t group);

src/system/libroot/posix/unistd/sync.c

@@ -22,14 +22,9 @@ fsync(int fd)
 }
 
 
-int
+void
 sync(void)
 {
-	int status = _kern_sync();
-	if (status < 0) {
-		__set_errno(status);
-		status = -1;
-	}
-
-	return status;
+	_kern_sync();
 }
+