hush more lgtm.com -discovered static-analysis problems

src/wormhole/cli/cmd_receive.py

@@ -164,6 +164,7 @@ class Receiver:
                 recognized = True
                 if not want_offer:
                     raise TransferError("duplicate offer")
+                want_offer = False
                 try:
                     yield self._parse_offer(them_d[u"offer"], w)
                 except RespondError as r:

src/wormhole/ipaddrs.py

@@ -56,8 +56,9 @@ def find_addresses():
 
 def _query(path, args, regex):
     env = {'LANG': 'en_US.UTF-8'}
-    TRIES = 5
-    for trial in range(TRIES):
+    trial = 0
+    while True:
+        trial += 1
         try:
             p = subprocess.Popen([path] + list(args),
                                  stdout=subprocess.PIPE,
@@ -67,7 +68,7 @@ def _query(path, args, regex):
             (output, err) = p.communicate()
             break
         except OSError as e:
-            if e.errno == errno.EINTR and trial < TRIES-1:
+            if e.errno == errno.EINTR and trial < 5:
                 continue
             raise