Remove misplaced asserts. connection_resched changes connection state

to UNUSED without holding connections mutex.  It's not safe for
connection_init to check connection state until after acquires the
c_mutex.

servers/slapd/connection.c

@@ -348,8 +348,6 @@ long connection_init(
 #endif
 
     assert( c != NULL );
-    assert( c->c_struct_state != SLAP_C_USED );
-    assert( c->c_conn_state == SLAP_C_INVALID );
 
     if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
         c->c_dn = NULL;