Fix test scripts for split error files

This commit fixes failing tests to do with generated files and code
styles.

Signed-off-by: Harry Ramsey <harry.ramsey@arm.com>
diff --git a/tests/scripts/check-generated-files.sh b/tests/scripts/check-generated-files.sh
index 583c26e..a224e58 100755
--- a/tests/scripts/check-generated-files.sh
+++ b/tests/scripts/check-generated-files.sh
@@ -170,7 +170,7 @@
 
 # Additional checks for Mbed TLS only
 if in_mbedtls_repo; then
-    check scripts/generate_errors.pl ${builtin_drivers_dir}/error.c
+    check scripts/generate_errors.pl library/error.c
     check scripts/generate_query_config.pl programs/test/query_config.c
     check scripts/generate_features.pl library/version_features.c
     check framework/scripts/generate_ssl_debug_helpers.py library/ssl_debug_helpers_generated.c