Fix warning: variable 'buf_len' set but not used [-Wunused-but-set-variable]
Fix yar_client.c:233:21: warning: 'factory' may be used uninitialized in this function [-Wmaybe-uninitialized]
Fix transports/curl.c:421:8: warning: variable 'cp' set but not used [-Wunused-but-set-variable]
Fix: transports/curl.c:724:5: warning: format '%d' expects argument of type 'int', but argument 4 has type 'ulong' [-Wformat=]
Fix various  [-Wformat=]
Fix  [-Wmaybe-uninitialized]: please CHECK this one
Merge pull request #7 from remicollet/issue-wall

Issue build warnings