fix(unittests): use -1ULL to mean UNSIGNED MATH.MAX

test/unit/marktree_spec.lua

@@ -590,7 +590,7 @@ describe('marktree', function()
     lib.marktree_check(tree)
     local iter = ffi.new('MarkTreeIter[1]')
     local filter = ffi.new('uint32_t[4]')
-    filter[0] = -1
+    filter[0] = -1ULL
     ok(lib.marktree_itr_get_filter(tree, 0, 0, 101, 0, filter, iter))
     local seen = {}
     repeat

test/unit/os/fs_spec.lua

@@ -278,7 +278,7 @@ describe('fs.c', function()
       itp('does not change owner and group if respective IDs are equal to -1', function()
         local uid = uv.fs_stat(filename).uid
         local gid = uv.fs_stat(filename).gid
-        eq(0, os_fchown(filename, -1, -1))
+        eq(0, os_fchown(filename, -1ULL, -1ULL))
         eq(uid, uv.fs_stat(filename).uid)
         return eq(gid, uv.fs_stat(filename).gid)
       end)
@@ -304,7 +304,7 @@ describe('fs.c', function()
             -- User can be a member of only one group.
             -- In that case we can not perform this test.
             if new_gid then
-              eq(0, (os_fchown(filename, -1, new_gid)))
+              eq(0, (os_fchown(filename, -1ULL, new_gid)))
               eq(new_gid, uv.fs_stat(filename).gid)
             end
           end