fix some max_mixdepth off-by-one errors

jmclient/jmclient/taker.py

@@ -179,7 +179,7 @@ class Taker(object):
             #if destination is flagged "INTERNAL", choose a destination
             #from the next mixdepth modulo the maxmixdepth
             if self.my_cj_addr == "INTERNAL":
-                next_mixdepth = (self.mixdepth + 1) % self.wallet.max_mix_depth
+                next_mixdepth = (self.mixdepth + 1) % (self.wallet.max_mixdepth + 1)
                 jlog.info("Choosing a destination from mixdepth: " + str(next_mixdepth))
                 self.my_cj_addr = self.wallet.get_internal_addr(next_mixdepth)
                 jlog.info("Chose destination address: " + self.my_cj_addr)

jmclient/jmclient/yieldgenerator.py

@@ -129,8 +129,8 @@ class YieldGeneratorBasic(YieldGenerator):
         jlog.info('filling offer, mixdepth=' + str(mixdepth))
 
         # mixdepth is the chosen depth we'll be spending from
-        cj_addr = self.wallet.get_internal_addr((mixdepth + 1) %
-                                                self.wallet.max_mix_depth)
+        cj_addr = self.wallet.get_internal_addr(
+            (mixdepth + 1) % (self.wallet.max_mixdepth + 1))
         change_addr = self.wallet.get_internal_addr(mixdepth)
         self.import_new_addresses([cj_addr, change_addr])