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If grub_strdup() fails, it returns NULL and passing NULL further down to the code can lead to segmentation fault or an undefined behavior. Signed-off-by: Avnish Chouhan <avnish@linux.ibm.com> Reviewed-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>