Florian,
The format used for formatting SYSFS_FLAG_FW_SEL_BOOT creates the
following warning:
drivers/scsi/qedi/qedi_main.c:2259:35: warning: format specifies type
'char' but the argument has type 'int' [-Wformat]
rc = snprintf(buf, 3, "%hhd\n",
SYSFS_FLAG_FW_SEL_BOOT);
Fix this to cast the constant as an u8 since the intention is to print
it via sysfs as a byte.
The other occurrences of SYSFS_FLAG_FW_SEL_BOOT use "%d". Since %hh is
deprecated I suggest you just fix the snprintf().