MEDIUM: stconn: Rely on SC flags to handle errors instead of SE flags

It is the last commit on this subject. we stop to use SE_FL_ERROR flag from
the SC, except at the I/O level. Otherwise, we rely on SC_FL_ERROR
flag. Now, there should be a real separation between SE flags and SC flags.
diff --git a/src/stconn.c b/src/stconn.c
index f4d54a7..8c72e36 100644
--- a/src/stconn.c
+++ b/src/stconn.c
@@ -579,7 +579,7 @@
 		 * However, if SC_FL_NOLINGER is explicitly set, we know there is
 		 * no risk so we close both sides immediately.
 		 */
-		if (!(sc->flags & (SC_FL_ERROR|SC_FL_NOLINGER|SC_FL_ABRT_DONE)) && !sc_ep_test(sc, SE_FL_ERROR) &&
+		if (!(sc->flags & (SC_FL_ERROR|SC_FL_NOLINGER|SC_FL_ABRT_DONE)) &&
 		    !(ic->flags & CF_DONT_READ))
 			return;
 
@@ -705,7 +705,7 @@
 		 * no risk so we close both sides immediately.
 		 */
 
-		if ((sc->flags & SC_FL_ERROR) || sc_ep_test(sc, SE_FL_ERROR)) {
+		if (sc->flags & SC_FL_ERROR) {
 			/* quick close, the socket is already shut anyway */
 		}
 		else if (sc->flags & SC_FL_NOLINGER) {
@@ -903,7 +903,7 @@
 		 * However, if SC_FL_NOLINGER is explicitly set, we know there is
 		 * no risk so we close both sides immediately.
 		 */
-		if (!(sc->flags & (SC_FL_ERROR|SC_FL_NOLINGER|SC_FL_ABRT_DONE)) && !sc_ep_test(sc, SE_FL_ERROR) &&
+		if (!(sc->flags & (SC_FL_ERROR|SC_FL_NOLINGER|SC_FL_ABRT_DONE)) &&
 		    !(ic->flags & CF_DONT_READ))
 			return;
 
@@ -1101,7 +1101,7 @@
 	     *                  read event while consumer side is not established (CF_READ_EVENT + sco->state != SC_ST_EST)
 	     */
 		((ic->flags & CF_READ_EVENT) && ((sc->flags & SC_FL_EOI) || (sc->flags & SC_FL_ABRT_DONE) || !ic->to_forward || sco->state != SC_ST_EST)) ||
-		(sc->flags & SC_FL_ERROR) || sc_ep_test(sc, SE_FL_ERROR) ||
+		(sc->flags & SC_FL_ERROR) ||
 
 	    /* changes on the consumption side */
 	    sc_ep_test(sc, SE_FL_ERR_PENDING) ||