Fix run-all-tests script when --always-clean is used

Change-Id: Icd44776e77c00f789bb579b6e55241abdfc0e68d
diff --git a/test/run-all-tests b/test/run-all-tests
index d0b3cf9..13490c4 100755
--- a/test/run-all-tests
+++ b/test/run-all-tests
@@ -112,6 +112,7 @@
         shift;
     elif [ "x$1" = "x--always-clean" ]; then
         run_args="${run_args} --always-clean"
+        shift
     elif expr "x$1" : "x--" >/dev/null 2>&1; then
         echo "unknown $0 option: $1" 1>&2
         usage="yes"