remove unnecessary grep

tests/test_abort.sh.in

@@ -3,5 +3,5 @@
 @TEST_MPI_FALSE@exit 77
 
 @MPI_LAUNCH@ -n 2 ./test_abort.x 2> /dev/null && exit 1
-@MPI_LAUNCH@ -n 2 @SHELL@ -c "./test_abort_c.x | @GREP@ 'custom_error_handler called'"
+@MPI_LAUNCH@ -n 2 ./test_abort_c.x
 

tests/test_abort_c.c

@@ -105,8 +105,6 @@ static void custom_error_handler(
 
   if (line != ref_line) PUT_ERR("error in yac_abort_message (line)");
 
-  printf("custom_error_handler called\n");
-
   // MPI_Abort may yield non-zero error codes of mpirun hence we
   // terminate the programm gracefully
   MPI_Finalize();