Only unlink socket on ECONNREFUSED, not on any connect failure

connect() can fail with EAGAIN (backlog full) or EACCES (permissions)
when the daemon IS alive. Only ECONNREFUSED means no listener (stale
socket from crashed daemon). Other errors: assume daemon is alive and
let proxy_connect handle it.

Author: semihalev

ext/stoolap.c

@@ -1260,9 +1260,16 @@ static int ensure_daemon_running(void)
                 close(probe);
                 return 0; /* daemon is alive */
             }
+            int err = errno;
             close(probe);
-            /* Stale socket from crashed daemon — remove so bind() can succeed */
-            unlink(STOOLAP_DAEMON_SOCK);
+            if (err == ECONNREFUSED) {
+                /* No listener — stale socket from crashed daemon */
+                unlink(STOOLAP_DAEMON_SOCK);
+            } else {
+                /* Other error (EAGAIN, EACCES, etc.) — daemon may be alive
+                 * but busy or inaccessible. Don't unlink. Let bind() decide. */
+                return 0;
+            }
         }
     }