git p4: fix labelDetails typo in exception

Signed-off-by: Pete Wyckoff <pw@padd.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: Pete Wyckoff

git-p4.py

@@ -2406,7 +2406,7 @@ def importP4Labels(self, stream, p4Labels):
                     try:
                         tmwhen = time.strptime(labelDetails['Update'], "%Y/%m/%d %H:%M:%S")
                     except ValueError:
-                        print "Could not convert label time %s" % labelDetail['Update']
+                        print "Could not convert label time %s" % labelDetails['Update']
                         tmwhen = 1
 
                     when = int(time.mktime(tmwhen))