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The term 'len' only represents the number of characters in a string,
as opposed to 'size' which means the number of bytes including the
terminating null byte ('\0').
DEV_NAME_LEN is defined as IFNAMSIZ, so we are clearly interested in the
size. Rename to DEV_NAME_SIZE to make this more clear.
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>