[RFC PATCH v1 4/8] vfio-ccw: Refactor cleanup of regions

[Eric Farman <farman@linux.ibm.com>]

While we're at it, add a g_free() for the async_cmd_region that
is the last thing currently created.  g_free() knows how to handle
NULL pointers, so this makes it easier to remember what cleanups
need to be performed when new regions are added.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
---
 hw/vfio/ccw.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 0590a6f512..3e32bc1819 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -376,8 +376,7 @@ static void vfio_ccw_get_region(VFIOCCWDevice *vcdev, Error **errp)
     vcdev->io_region_size = info->size;
     if (sizeof(*vcdev->io_region) != vcdev->io_region_size) {
         error_setg(errp, "vfio: Unexpected size of the I/O region");
-        g_free(info);
-        return;
+        goto out_err;
     }
 
     vcdev->io_region_offset = info->offset;
@@ -390,15 +389,20 @@ static void vfio_ccw_get_region(VFIOCCWDevice *vcdev, Error **errp)
         vcdev->async_cmd_region_size = info->size;
         if (sizeof(*vcdev->async_cmd_region) != vcdev->async_cmd_region_size) {
             error_setg(errp, "vfio: Unexpected size of the async cmd region");
-            g_free(vcdev->io_region);
-            g_free(info);
-            return;
+            goto out_err;
         }
         vcdev->async_cmd_region_offset = info->offset;
         vcdev->async_cmd_region = g_malloc0(info->size);
     }
 
     g_free(info);
+    return;
+
+out_err:
+    g_free(vcdev->async_cmd_region);
+    g_free(vcdev->io_region);
+    g_free(info);
+    return;
 }
 
 static void vfio_ccw_put_region(VFIOCCWDevice *vcdev)
-- 
2.17.1