misc/pvpanic: use bit macros
The macros are easier to read.
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/lkml/2023110407-unselect-uptight-b96d@gregkh/
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20240313-pvpanic-shutdown-header-v1-1-7f1970d66366@weissschuh.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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