dasdfmt: Fixup dasdfmt_get_volser()
dasdfmt: Fixup dasdfmt_get_volser()

dasdfmt_get_volser() opens its own private filedescriptor
despite the global filedes already being opened.
And we should be passing in only the bits of the info structure
that we actually need.

GitHub-ID: #8

Signed-off-by: Hannes Reinecke <b0d1e9e4a4e27620745ff49be9000da3174a4cc6@suse.com>
Acked-by: Jan Höppner <96138615ab4af0813785fa10d283f3d37eca3b78@linux.vnet.ibm.com>
Signed-off-by: Michael Holzheu <db4757c56f54651f568cc7cda79cd93c781b1605@linux.vnet.ibm.com>

ibm-s390-tools/s390-tools,ibm-s390-tools/s390-tools,ibm-s390-tools/s390-tools,ibm-s390-tools/s390-tools