usb: fix serial build when SYSRQ is disabled
Fix build error when CONFIG_MAGIC_SYSRQ is not enabled: drivers/usb/serial/generic.c:566: error: implicit declaration of function 'handle_sysrq' Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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