fix return type of readlink

src/include/longpath/longpath_tbl_functions.h

@@ -49,7 +49,7 @@ FUNCTION(int, utimensat, int, const char *, const struct timespec *, int)
 /* lstat */
 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG_2) || defined(__EXTENSIONS__)
 FUNCTION(int, symlink, const char *, const char *)
-FUNCTION(int, readlink, const char *, char *, size_t)
+FUNCTION(size_t, readlink, const char *, char *, size_t)
 FUNCTION(int, lchown, const char *, uid_t, gid_t)
 #endif