nir/dead_cf: Call instructions aren't dead

When we inlined cf_node_has_side_effects into node_is_dead, all the
conditions flipped and we forgot to flip one.  Fortunately, it doesn't
matter right now because no one uses this pass on shaders with more than
one function.

Fixes: b50465d197 "nir/dead_cf: Inline cf_node_has_side_effects"
Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>

src/compiler/nir/nir_opt_dead_cf.c

@@ -216,7 +216,7 @@ node_is_dead(nir_cf_node *node)
 
       nir_foreach_instr(instr, block) {
          if (instr->type == nir_instr_type_call)
-            return true;
+            return false;
 
          /* Return instructions can cause us to skip over other side-effecting
           * instructions after the loop, so consider them to have side effects