CLEANUP: mux-h2: don't test for impossible CS_FL_REOS conditions

This flag is currently set when an incoming close was received, which
results in the stream being in either H2_SS_HREM, H2_SS_CLOSED, or
H2_SS_ERROR states, so let's remove the test for the OPEN and HLOC
cases.
diff --git a/src/mux_h2.c b/src/mux_h2.c
index bf6c53d..9455ff9 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -2078,9 +2078,9 @@
 
 	if (h2s->cs && h2s->cs->flags & CS_FL_ERROR && h2s->st < H2_SS_ERROR)
 		h2s->st = H2_SS_ERROR;
-	else if (h2s->cs && (h2s->cs->flags & (CS_FL_EOI|CS_FL_REOS)) && h2s->st == H2_SS_OPEN)
+	else if (h2s->cs && (h2s->cs->flags & CS_FL_EOI) && h2s->st == H2_SS_OPEN)
 		h2s->st = H2_SS_HREM;
-	else if ((!h2s->cs || h2s->cs->flags & (CS_FL_EOI|CS_FL_REOS)) && h2s->st == H2_SS_HLOC)
+	else if ((!h2s->cs || h2s->cs->flags & CS_FL_EOI) && h2s->st == H2_SS_HLOC)
 		h2s_close(h2s);
 
 	return h2s;