tests: explicit use bash

We use bashisms, which debian's default sh dash doesn't like.

Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

tests/check_drm_clients

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 SOURCE_DIR="$( dirname "${BASH_SOURCE[0]}" )"
 . $SOURCE_DIR/drm_lib.sh

tests/debugfs_emon_crash

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #
 # This check if we can crash the kernel with segmentation-fault
 # by reading /sys/kernel/debug/dri/0/i915_emon_status too quickly

tests/debugfs_reader

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 SOURCE_DIR="$( dirname "${BASH_SOURCE[0]}" )"
 . $SOURCE_DIR/drm_lib.sh