tests/extmod/vfs_basic: Allow test to pass on embedded targets.

tests/extmod/vfs_basic.py

@@ -56,8 +56,8 @@ for path in uos.listdir('/'):
 # stat root dir
 print(uos.stat('/'))
 
-# statvfs root dir
-print(uos.statvfs('/'))
+# statvfs root dir; verify that f_namemax has a sensible size
+print(uos.statvfs('/')[9] >= 32)
 
 # getcwd when in root dir
 print(uos.getcwd())

tests/extmod/vfs_basic.py.exp

 (16384, 0, 0, 0, 0, 0, 0, 0, 0, 0)
-(0, 0, 0, 0, 0, 0, 0, 0, 0, 4096)
+True
 /
 1 mount False False
 ['test_mnt']