12159 truss psflags printing is broken

@@ -1628,13 +1628,16 @@
                 (void) strlcat(str, "|PROC_SEC_NOEXECSTACK",
                     sizeof (str));
                 secflag_clear(&val, PROC_SEC_NOEXECSTACK);
         }
 
+        if (val != 0) {
         len = strlen(str);
         ptr = str + len;
         (void) snprintf(ptr, sizeof (str) - len, "|%#x", val);
+        }
+
         outstring(pri, str + 1);
 }
 
 /*
  * Print a psecflags(2) delta