net/rocker: Plug memory leak in pci_rocker_init()

pci_rocker_init() leaks a World when the name more than 9 chars,
then return a negative value directly, doesn't make a correct
cleanup. So add a new goto label to fix it.

Cc: jasowang@redhat.com
Cc: jiri@resnulli.us
Cc: armbru@redhat.com
Cc: f4bug@amsat.org
Signed-off-by: Mao Zhongyi <maozy.fnst@cn.fujitsu.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>

hw/net/rocker/rocker.c

@@ -1355,7 +1355,8 @@ static int pci_rocker_init(PCIDevice *dev)
         fprintf(stderr,
                 "rocker: name too long; please shorten to at most %d chars\n",
                 MAX_ROCKER_NAME_LEN);
-        return -EINVAL;
+        err = -EINVAL;
+        goto err_name_too_long;
     }
 
     if (memcmp(&r->fp_start_macaddr, &zero, sizeof(zero)) == 0) {
@@ -1414,6 +1415,7 @@ static int pci_rocker_init(PCIDevice *dev)
 
     return 0;
 
+err_name_too_long:
 err_duplicate:
     rocker_msix_uninit(r);
 err_msix_init: