qga: Use g_new() & friends where that makes obvious sense

g_new(T, n) is neater than g_malloc(sizeof(T) * n).  It's also safer,
for two reasons.  One, it catches multiplication overflowing size_t.
Two, it returns T * rather than void *, which lets the compiler catch
more type errors.

This commit only touches allocations with size arguments of the form
sizeof(T).  Same Coccinelle semantic patch as in commit b45c03f.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
diff --git a/qga/commands.c b/qga/commands.c
index 7834967..9a765e8 100644
--- a/qga/commands.c
+++ b/qga/commands.c
@@ -51,12 +51,12 @@
     GuestAgentCommandInfo *cmd_info;
     GuestAgentCommandInfoList *cmd_info_list;
 
-    cmd_info = g_malloc0(sizeof(GuestAgentCommandInfo));
+    cmd_info = g_new0(GuestAgentCommandInfo, 1);
     cmd_info->name = g_strdup(qmp_command_name(cmd));
     cmd_info->enabled = qmp_command_is_enabled(cmd);
     cmd_info->success_response = qmp_has_success_response(cmd);
 
-    cmd_info_list = g_malloc0(sizeof(GuestAgentCommandInfoList));
+    cmd_info_list = g_new0(GuestAgentCommandInfoList, 1);
     cmd_info_list->value = cmd_info;
     cmd_info_list->next = info->supported_commands;
     info->supported_commands = cmd_info_list;
@@ -64,7 +64,7 @@
 
 struct GuestAgentInfo *qmp_guest_info(Error **errp)
 {
-    GuestAgentInfo *info = g_malloc0(sizeof(GuestAgentInfo));
+    GuestAgentInfo *info = g_new0(GuestAgentInfo, 1);
 
     info->version = g_strdup(QEMU_VERSION);
     qmp_for_each_command(qmp_command_info, info);