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Function strtoull() silently accepts a leading '-' and returns a large positive number (two's complement wrap). Reject this by checking for the minus character. Assisted-by: IBM Bob:2.0.0 Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com> Reviewed-by: Finn Callies <fcallies@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>