inpcom.c, inp_modify_exp(expr), offload tfree(expr) to the invoker
inpcom.c, inp_bsource_compat(), fix an assertion
inpcom.c, inp_bsource_compat(), shrink brace removal to the actual b-expression
inpcom.c, use inp_modify_exp() to remove duplicated code in inp_bsource_compat()
inpcom.c, use tprintf() to simplify code in inp_bsource_compat()