environment: add missing newline

Signed-off-by: Sean Gilligan <sean@msgilligan.com>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>

Author: msgilligan

environment

@@ -59,4 +59,4 @@ then
 else
   echo -e "Error: OPTEE_CLIENT_EXPORT=$OPTEE_CLIENT_EXPORT does not exist, please set the correct OPTEE_CLIENT_EXPORT or run \"$ ./build_optee_libraries.sh optee/\" then try again\n"
   unset OPTEE_DIR
-fi
+fi