[PATCH 5/6] hw/scsi/megasas: Silent GCC9 duplicated-cond warning

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

GCC9 is confused when building with CFLAG -O3:

  hw/scsi/megasas.c: In function ‘megasas_scsi_realize’:
  hw/scsi/megasas.c:2387:26: error: duplicated ‘if’ condition [-Werror=duplicated-cond]
   2387 |     } else if (s->fw_sge >= 128 - MFI_PASS_FRAME_SIZE) {
  hw/scsi/megasas.c:2385:19: note: previously used here
   2385 |     if (s->fw_sge >= MEGASAS_MAX_SGE - MFI_PASS_FRAME_SIZE) {
  cc1: all warnings being treated as errors

When this device was introduced in commit e8f943c3bcc, the author
cared about modularity, using a definition for the firmware limit.
If we modify the limit, the code is valid. Add a check if the
definition got modified to a bigger limit.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
Cc: Hannes Reinecke <hare@suse.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Fam Zheng <fam@euphon.net>
Cc: qemu-block@nongnu.org
---
 hw/scsi/megasas.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index de9bd20887..ece1601b66 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -2382,7 +2382,8 @@ static void megasas_scsi_realize(PCIDevice *dev, Error **errp)
     if (!s->hba_serial) {
         s->hba_serial = g_strdup(MEGASAS_HBA_SERIAL);
     }
-    if (s->fw_sge >= MEGASAS_MAX_SGE - MFI_PASS_FRAME_SIZE) {
+    if (MEGASAS_MAX_SGE > 128
+        && s->fw_sge >= MEGASAS_MAX_SGE - MFI_PASS_FRAME_SIZE) {
         s->fw_sge = MEGASAS_MAX_SGE - MFI_PASS_FRAME_SIZE;
     } else if (s->fw_sge >= 128 - MFI_PASS_FRAME_SIZE) {
         s->fw_sge = 128 - MFI_PASS_FRAME_SIZE;
-- 
2.21.0