Explicitly specify exit code for "exit /b"

"exit /b" without an explicit exit value doesn't copy the value of the
last command executed, causing issues on Jenkins.

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
diff --git a/scripts/make_generated_files.bat b/scripts/make_generated_files.bat
index 4c4b53e..e4465d8 100644
--- a/scripts/make_generated_files.bat
+++ b/scripts/make_generated_files.bat
@@ -1,9 +1,9 @@
 @rem Generate automatically-generated configuration-independent source files

 @rem and build scripts.

 @rem Perl and Python 3 must be on the PATH.

-perl scripts\generate_errors.pl || exit /b

-perl scripts\generate_query_config.pl || exit /b

-perl scripts\generate_features.pl || exit /b

-perl scripts\generate_visualc_files.pl || exit /b

-python scripts\generate_psa_constants.py || exit /b

-python tests\scripts\generate_psa_tests.py || exit /b

+perl scripts\generate_errors.pl || exit /b 1

+perl scripts\generate_query_config.pl || exit /b 1

+perl scripts\generate_features.pl || exit /b 1

+perl scripts\generate_visualc_files.pl || exit /b 1

+python scripts\generate_psa_constants.py || exit /b 1

+python tests\scripts\generate_psa_tests.py || exit /b 1