darwin9 does not malloc on NULL resolved_path

https://github.com/pkgconf/pkgconf/pull/208

--- a/libpkgconf/path.c
+++ b/libpkgconf/path.c
@@ -92,15 +92,11 @@
 			return;
 		if (S_ISLNK(st.st_mode))
 		{
-			char *linkdest = realpath(path, NULL);
+			char pathbuf[PATH_MAX];
+			char *linkdest = realpath(path, pathbuf);
 
 			if (linkdest != NULL && stat(linkdest, &st) == -1)
-			{
-				free(linkdest);
 				return;
-			}
-
-			free(linkdest);
 		}
 		if (path_list_contains_entry(path, dirlist, &st))
 			return;