[PATCH 1/2] hw: megasas: return -1 when 'megasas_map_sgl' fails

[Li Qiang]

The caller of 'megasas_map_sgl' will only check if the return
is zero or not. If it return 0 it means success, as in the next
patch we will consider 'iov_count=0' is an error, so let's
return -1 to indicate a failure.

Signed-off-by: Li Qiang <liq3ea@163.com>
---
 hw/scsi/megasas.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index 5cfd1bf22e..d6c9680c36 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -281,7 +281,7 @@ static int megasas_map_sgl(MegasasState *s, MegasasCmd 
*cmd, union mfi_sgl *sgl)
     if (iov_count > MEGASAS_MAX_SGE) {
         trace_megasas_iovec_sgl_overflow(cmd->index, iov_count,
                                          MEGASAS_MAX_SGE);
-        return iov_count;
+        return -1;
     }
     pci_dma_sglist_init(&cmd->qsg, PCI_DEVICE(s), iov_count);
     for (i = 0; i < iov_count; i++) {
@@ -311,7 +311,7 @@ static int megasas_map_sgl(MegasasState *s, MegasasCmd 
*cmd, union mfi_sgl *sgl)
     return 0;
 unmap:
     qemu_sglist_destroy(&cmd->qsg);
-    return iov_count - i;
+    return -1;
 }
 
 /*
-- 
2.17.1