[sr-dev] master compiler warnings

debian wheezy gcc provides these compiler warnings on master. at least the avpops ones i don't remember seeing earlier. -- juha CC (cc) [M avpops.so] avpops_impl.o avpops_impl.c: In function 'ops_dbload_avps': avpops_impl.c:294:2: warning: missing braces around initializer [-Wmissing-braces] avpops_impl.c:294:2: warning: (near initialization for 'xvalue.rs') [-Wmissing-braces] CC (cc) [M sctp.so] sctp_mod.o sctp_mod.c:125:12: warning: 'sctp_mod_pre_init' defined but not used [-Wunused-function] CC (cc) [M tls.so] tls_server.o tls_server.c: In function 'tls_complete_init': tls_server.c:192:3: warning: variable 'ret' set but not used [-Wunused-but-set-variable] tls_server.c: In function 'tls_shutdown': tls_server.c:521:4: warning: variable 'ret' set but not used [-Wunused-but-set-variable] tls_server.c: In function 'tls_encode_f': tls_server.c:798:5: warning: variable 'ret' set but not used [-Wunused-but-set-variable] tls_server.c:832:5: warning: variable 'ret' set but not used [-Wunused-but-set-variable] tls_server.c: In function 'tls_read_f': tls_server.c:1186:4: warning: variable 'ret' set but not used [-Wunused-but-set-variable] tls_server.c:1220:4: warning: variable 'ret' set but not used [-Wunused-but-set-variable]