multi-process: Initialize variables declared with g_auto*

Quote docs/devel/style.rst (section "Automatic memory deallocation"):

* Variables declared with g_auto* MUST always be initialized,
  otherwise the cleanup function will use uninitialized stack memory

Initialize @name properly to get rid of the compilation error (using
gcc-7.3.0 on CentOS):

../hw/remote/proxy.c: In function 'pci_proxy_dev_realize':
/usr/include/glib-2.0/glib/glib-autocleanups.h:28:3: error: 'name' may be used uninitialized in this function [-Werror=maybe-uninitialized]
   g_free (*pp);
   ^~~~~~~~~~~~
../hw/remote/proxy.c:350:30: note: 'name' was declared here
             g_autofree char *name;
                              ^~~~

Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Reviewed-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Miroslav Rezanina <mrezanin@redhat.com>
Message-id: 20210312112143.1369-1-yuzenghui@huawei.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

hw/remote/memory.c

@@ -41,10 +41,9 @@ void remote_sysmem_reconfig(MPQemuMsg *msg, Error **errp)
 
     remote_sysmem_reset();
 
-    for (region = 0; region < msg->num_fds; region++) {
-        g_autofree char *name;
+    for (region = 0; region < msg->num_fds; region++, suffix++) {
+        g_autofree char *name = g_strdup_printf("remote-mem-%u", suffix);
         subregion = g_new(MemoryRegion, 1);
-        name = g_strdup_printf("remote-mem-%u", suffix++);
         memory_region_init_ram_from_fd(subregion, NULL,
                                        name, sysmem_info->sizes[region],
                                        true, msg->fds[region],

hw/remote/proxy.c

@@ -347,13 +347,12 @@ static void probe_pci_info(PCIDevice *dev, Error **errp)
                    PCI_BASE_ADDRESS_SPACE_IO : PCI_BASE_ADDRESS_SPACE_MEMORY;
 
         if (size) {
-            g_autofree char *name;
+            g_autofree char *name = g_strdup_printf("bar-region-%d", i);
             pdev->region[i].dev = pdev;
             pdev->region[i].present = true;
             if (type == PCI_BASE_ADDRESS_SPACE_MEMORY) {
                 pdev->region[i].memory = true;
             }
-            name = g_strdup_printf("bar-region-%d", i);
             memory_region_init_io(&pdev->region[i].mr, OBJECT(pdev),
                                   &proxy_mr_ops, &pdev->region[i],
                                   name, size);