tests: drop duplicate PR-unsupported log messages

The helper function -2 return paths already print this message, so the
duplicate in the caller can be dropped.

Signed-off-by: David Disseldorp <ddiss@suse.de>

test-tool/test_prout_preempt.c

@@ -54,7 +54,6 @@ test_prout_preempt_rm_reg(void)
 
         ret = prout_register_and_ignore(sd, k1);
         if (ret == -2) {
-                logging(LOG_NORMAL, "[SKIPPED] PERSISTEN RESERVE OUT is not implemented.");
                 CU_PASS("PERSISTENT RESERVE OUT is not implemented.");
                 return;
         }