Correct the funciton to calculate raid size

Correct the funciton to del raid

       modified:   interface/ri_data.py
       modified:   new_partition/interface_partition.py
       modified:   text/ri_main.py
       modified:   text/ri_newt.py

text/ri_main.py

@@ -26,7 +26,7 @@ while True :
 		if init_flag:
 			ri_data.init()
 			init_flag = False
-		if len(ri_newt.Raid.init_from_internal()) < 2:
+		if len(ri_newt.Raid.init_from_internal()) < 2 and len(ri_data.Raid.dict) == 0:
 			if list[2] == 'raid':
 				del list[2]
 		else:

text/ri_newt.py

@@ -417,6 +417,14 @@ class Raid(Screen):
 		if s == 0:
 			device = Screen.listbox.current()
 			del ri_data.Raid.dict[device]
+			try:
+				os.system('umount /dev/%s >/dev/null 2>&1' %(device))
+			except:
+				pass
+			try:
+				os.system('mdadm --stop /dev/%s >/dev/null 2>&1' %(device))
+			except:
+				pass
 		return s
 
 	def set_data(self):