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).

Patch created mechanically with:

    $ spatch --in-place --sp-file scripts/coccinelle/use-g_new-etc.cocci \
	     --macro-file scripts/cocci-macro-file.h FILES...

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20220315144156.1595462-4-armbru@redhat.com>
Reviewed-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index b9b18a7..75ed71e 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -5076,7 +5076,7 @@
     target_size = thunk_type_size(arg_type, THUNK_TARGET);
 
     /* construct host copy of urb and metadata */
-    lurb = g_try_malloc0(sizeof(struct live_urb));
+    lurb = g_try_new0(struct live_urb, 1);
     if (!lurb) {
         return -TARGET_ENOMEM;
     }