zipl: fix -Wmaybe-uninitialized
zipl: fix -Wmaybe-uninitialized

Reported by GCC 9.2.1 when building with '-Wmaybe-uninitialized'.

job.c: In function 'job_get':
job.c:1817:14: warning: 'filename' may be used uninitialized in this function [-Wmaybe-uninitialized]
 1817 |  scan_size = scan_file(filename, &scan);
      |              ^~~~~~~~~~~~~~~~~~~~~~~~~~
job.c:1791:14: note: 'filename' was declared here
 1791 |  const char *filename;
      |              ^~~~~~~~

Signed-off-by: Marc Hartmayer <7bafc8cd4e6394916d396e4f8cde69753be8d066@linux.ibm.com>
Reviewed-by: Stefan Haberland <dec981e3bbb165d021029c42291faf06f59827c1@linux.ibm.com>
Signed-off-by: Jan Höppner <96138615ab4af0813785fa10d283f3d37eca3b78@linux.ibm.com>

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