radv: only emit ps_input_cntl is we have any to output
radv: only emit ps_input_cntl is we have any to output

Otherwise we get GPU hangs.

Reported-by: Alex Smith <329761ccbbac92b6d84b8e98fb67579293c7905d@feralinteractive.com>
Signed-off-by: Dave Airlie <f2295d84e358395675bc8031be58672073ae065e@redhat.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler