* child_info.h (~child_info_spawn): Check moreinfo->myself_pinfo for

NULL before closing.
	* spawn.cc (spawn_guts): Don't close moreinfo->myself_pinfo explicitely
	in case of failing CloseProcess.

	* fhandler.cc (fhandler_base::open_): Return EISDIR when trying to
	create a directory.
	* path.cc (path_conv::check): If input path had a trailing dir
	separator, tack it on to the native path if directory doesn't exist.

winsup/cygwin/child_info.h

@@ -125,7 +125,7 @@ public:
 	      cfree (*e);
 	    cfree (moreinfo->envp);
 	  }
-	if (type != _PROC_SPAWN)
+	if (type != _PROC_SPAWN && moreinfo->myself_pinfo)
 	  CloseHandle (moreinfo->myself_pinfo);
 	cfree (moreinfo);
       }