libtoml11/files/run-ptest: cleanup

Shellcheck -oall warnings fixed:
  - exit 1 if `cd tests` failes (SC2164)

  - Double quote `./${atest}` to prevent globbing and word splitting. (SC2086)

  - Check the test exit code directly intead of using $? (SC2181)

Other fixes:
  - The shebang sould traditionally be /usr/bin/env sh in case
    sh is not located in /bin.

  - Do not remove tests.log for every test.

Signed-off-by: Adam Duskett <adam.duskett@amarulasolutions.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-devtools/libtoml11/files/run-ptest

@@ -1,10 +1,11 @@
-#!/bin/sh
+#!/usr/bin/env sh
+
+cd tests || exit 1
+
+rm -rf tests.log
 
-cd tests
 for atest in test_* ; do
-    rm -rf tests.log
+    if ./"${atest}" >> tests.log 2>&1; then
-    ./${atest} > tests.log 2>&1
-    if [ $? = 0 ] ; then
         echo "PASS: ${atest}"
     else
         echo "FAIL: ${atest}"