controlif: declare controlif_setup() in control_cmd.h
this avoids us to copy+paste external declarations over all 'main'
files.
diff --git a/openbsc/include/openbsc/control_cmd.h b/openbsc/include/openbsc/control_cmd.h
index c94c7b5..82252cb 100644
--- a/openbsc/include/openbsc/control_cmd.h
+++ b/openbsc/include/openbsc/control_cmd.h
@@ -148,4 +148,7 @@
.verify = &verify_##cmdname, \
}
+struct gsm_network;
+int controlif_setup(struct gsm_network *gsmnet, uint16_t port);
+
#endif /* _CONTROL_CMD_H */