very slightly improved error message for not being able to find scripts

git-svn-id: svn://svn.berlios.de/openocd/trunk@854 b42882b7-edfa-0310-969c-e2dbd0fdcd60

src/helper/startup.tcl

@@ -136,7 +136,7 @@ proc find {filename} {
 		return $t
 	}  
 	# make sure error message matches original input string
-	return [ocd_find $filename]
+	return -code error "Can't find $filename"
 }
 add_help_text find "<file> - print full path to file according to OpenOCD search rules"