linux-user: 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>
Reviewed-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

linux-user/elfload.c

@@ -2853,7 +2853,7 @@ static int fill_note_info(struct elf_note_info *info,
     TaskState *ts = (TaskState *)cpu->opaque;
     int i;
 
-    info->notes = g_malloc0(NUMNOTES * sizeof (struct memelfnote));
+    info->notes = g_new0(struct memelfnote, NUMNOTES);
     if (info->notes == NULL)
         return (-ENOMEM);
     info->prstatus = g_malloc0(sizeof (*info->prstatus));

linux-user/main.c

@@ -4270,7 +4270,7 @@ int main(int argc, char **argv, char **envp)
     }
     target_argv[target_argc] = NULL;
 
-    ts = g_malloc0 (sizeof(TaskState));
+    ts = g_new0(TaskState, 1);
     init_task_state(ts);
     /* build Task State */
     ts->info = info;

linux-user/syscall.c

@@ -4566,7 +4566,7 @@ static int do_fork(CPUArchState *env, unsigned int flags, abi_ulong newsp,
         new_thread_info info;
         pthread_attr_t attr;
 
-        ts = g_malloc0(sizeof(TaskState));
+        ts = g_new0(TaskState, 1);
         init_task_state(ts);
         /* we create a new CPU instance. */
         new_env = cpu_copy(env);