[sr-dev] uac module unused var in master

[Juha Heinanen]

CC (gcc) [M uac.so]		uac_reg.o
uac_reg.c: In function 'rpc_uac_reg_active':
uac_reg.c:2110:6: warning: unused variable 'none' [-Wunused-variable]
  str none = {"none", 4};
      ^~~~