build-perf-test-wrapper.sh: fix issues with non-existing path arguments

Without the '-s' option realpath will error out if the given path does
not exist.

(From OE-Core rev: b80aba08ba56c7e8f847966b3593f6cedd1b1ee5)

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/contrib/build-perf-test-wrapper.sh

@@ -44,13 +44,13 @@ while getopts "ha:c:C:w:" opt; do
         h)  usage
             exit 0
             ;;
-        a)  archive_dir=`realpath "$OPTARG"`
+        a)  archive_dir=`realpath -s "$OPTARG"`
             ;;
         c)  commitish=$OPTARG
             ;;
         C)  results_repo=`realpath -s "$OPTARG"`
             ;;
-        w)  base_dir=`realpath "$OPTARG"`
+        w)  base_dir=`realpath -s "$OPTARG"`
             ;;
         *)  usage
             exit 1