The test case common.funcs.t_dtrace_contrib.tst_basename_d generates a

verifying script which needs being run to complete the test.

While here, add missing shebang.

Reviewed by:	gnn, markj, ngie
Differential Revision:	https://reviews.freebsd.org/D11716

cddl/usr.sbin/dtrace/tests/tools/dtest.sh

@@ -1,3 +1,5 @@
+#!/bin/sh
+
 # $FreeBSD$
 
 usage()
@@ -84,6 +86,12 @@ runtest()
         ;;
     esac
 
+    if [ $retval -eq 0 ] && \
+        head -n 1 $STDOUT | grep -q -E '^#!/.*ksh$'; then
+        ksh $STDOUT
+        retval=$?
+    fi
+
     return $retval
 }