* mount.h (fs_info::inited): New inline method.

* path.cc (path_conv::check): Clear filesystem info if following a
	symlink.  Use new fs_info::inited method to check if FS info is already
	available.
	(symlink_info::check): Drop fs_update_called.  Use fs_info::inited
	method instead.  Streamline test for leading space and trailing dot or
	space.  Add comments.

winsup/cygwin/mount.h

@@ -97,6 +97,7 @@ class fs_info
   const char *fsname () const { return fsn[0] ? fsn : "unknown"; }
 
   bool update (PUNICODE_STRING, HANDLE) __attribute__ ((regparm (3)));
+  bool inited () const { return !!status.flags; }
 };
 
 /* Mount table entry */