fix some coding style problems

It has:
1. More newlines make the code block well separated.
2. Add more comments for msi_init.
3. Fix a indentation in vmxnet3.c.
4. ioh3420 & xio3130_downstream: put PCI Express capability init function
   together, make it more readable.

cc: Michael S. Tsirkin <mst@redhat.com>
cc: Markus Armbruster <armbru@redhat.com>
cc: Marcel Apfelbaum <marcel@redhat.com>
cc: Dmitry Fleytman <dmitry@daynix.com>
cc: Jason Wang <jasowang@redhat.com>

Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c
index 16645e6c23..d97897670d 100644
--- a/hw/net/vmxnet3.c
+++ b/hw/net/vmxnet3.c
@@ -348,7 +348,7 @@ typedef struct {
 /* Interrupt management */
 
 /*
- *This function returns sign whether interrupt line is in asserted state
+ * This function returns sign whether interrupt line is in asserted state
  * This depends on the type of interrupt used. For INTX interrupt line will
  * be asserted until explicit deassertion, for MSI(X) interrupt line will
  * be deasserted automatically due to notification semantics of the MSI(X)