avoid dup check of guardSafeToUseRepo

Speeds up init slightly, and reduces the number of syscalls by the
dynamic linker.

Sponsored-by: Dartmouth College's Datalad project

Command/Reinit.hs

@@ -35,6 +35,6 @@ perform s = do
 		then return $ toUUID s
 		else Remote.nameToUUID s
 	storeUUID u
-	initialize' False Nothing
+	checkInitializeAllowed $ initialize' False Nothing
 	Annex.SpecialRemote.autoEnable
 	next $ return True