s390/lgr: Add init check to lgr_info_log()
If lgr has not been initialized, the lgr_info_log() function currently crashes because 'lgr_page' is not allocated. To fix this 'lgr_page' is allocated statically now. Signed-off-by: NMichael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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