Remove usage of exceptional fdsets with select().

src/examples/ntester.cc

@@ -153,10 +153,6 @@ int main( int argc, char *argv[] )
 	    /* we only read one socket each run */
 	    network_ready_to_read = true;
 	  }
-
-	  if ( sel.error( *it ) ) {
-	    break;
-	  }
 	}
 
 	if ( network_ready_to_read ) {

src/examples/parse.cc

@@ -158,8 +158,6 @@ static void emulate_terminal( int fd )
       if ( vt_parser( fd, &parser ) < 0 ) {
 	return;
       }
-    } else if ( sel.error( STDIN_FILENO ) || sel.error( fd ) ) {
-      return;
     } else {
       fprintf( stderr, "select mysteriously woken up\n" );
     }

src/examples/termemu.cc

@@ -311,8 +311,6 @@ static void emulate_terminal( int fd )
 	perror( "ioctl TIOCSWINSZ" );
 	return;
       }
-    } else if ( sel.error( STDIN_FILENO ) || sel.error( fd ) ) {
-      break;
     }
 
     Terminal::Framebuffer new_frame( complete.get_fb() );