scsi: qla2xxx: silence -Wformat-security warning

qla24xx_enable_msix() calls scnprintf() with a non-literal format
string. This makes clang report -Wformat-security warnings when
compiling this function:

    drivers/scsi/qla2xxx/qla_isr.c:3083:7: error: format string is not a
    string literal (potentially insecure) [-Werror,-Wformat-security]
                        msix_entries[i].name);
                        ^~~~~~~~~~~~~~~~~~~~
    drivers/scsi/qla2xxx/qla_isr.c:3083:7: note: treat the string as an
    argument to avoid this
                        msix_entries[i].name);
                        ^
                        "%s",
    drivers/scsi/qla2xxx/qla_isr.c:3119:7: error: format string is not a
    string literal (potentially insecure) [-Werror,-Wformat-security]
                        msix_entries[QLA_ATIO_VECTOR].name);
                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    drivers/scsi/qla2xxx/qla_isr.c:3119:7: note: treat the string as an
    argument to avoid this
                        msix_entries[QLA_ATIO_VECTOR].name);
                        ^
                        "%s",

Even though msix_entries[...].name are initialized as literal strings
with no % character and are never modified, introduce a "%s" format
parameter in order to silence this -Wformat-security warning and make
clang able to detect at compile time real bugs related to string
formatting.

[mkp: typo]

Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Acked-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>