Correct calculation of nr_nodes and re-enable move_pages test

This was pointed out by @bjsprakash in #8.

After the bug is corrected, we can re-enable the test in `make check`,
since most machines these days will have at least two nodes by default.

Travis-CI still fails with this test (one node only available), so keep
skipping it there.

Makefile.am

@@ -134,6 +134,7 @@ TESTS = \
 	test/checkaffinity \
 	test/checktopology \
 	test/distance \
+	test/move_pages \
 	test/nodemap \
 	test/numademo \
 	test/regress \

test/move_pages.c

@@ -28,7 +28,7 @@ int main(int argc, char **argv)
 
 	pagesize = getpagesize();
 
-	nr_nodes = numa_max_node();
+	nr_nodes = numa_max_node() + 1;
 
 	if (nr_nodes < 2) {
 		printf("A minimum of 2 nodes is required for this test.\n");