Refactor test script.

Author: reitermarkus

ci/test.sh

@@ -41,19 +41,17 @@ main() {
 
     export QEMU_STRACE=1
 
-    # test `cross check`
-    if [[ ! -z ${STD:-} ]]; then
+    if [[ ${STD:-} ]]; then
+        # test `cross check`
         td=$(mktemp -d)
         cargo init --lib --name foo $td
         pushd $td
         echo '#![no_std]' > src/lib.rs
         cross check --target $TARGET
         popd
         rm -rf $td
-    fi
-
-    # `cross build` test for targets where `std` is not available
-    if [[ -z "${STD:-}" ]]; then
+    else
+        # `cross build` test for targets where `std` is not available
         td=$(mktemp -d)
 
         git clone \