cleanup: Drop pointless return at end of function

A few functions now end with a label.  The next commit will clean them
up.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20250407082643.2310002-3-armbru@redhat.com>
[Straightforward conflict with commit 988ad4cceb (hw/loongarch/virt:
Fix cpuslot::cpu set at last in virt_cpu_plug()) resolved]

dump/win_dump.c

@@ -476,8 +476,6 @@ out_free:
     g_free(saved_ctx);
 out_cr3:
     first_x86_cpu->env.cr[3] = saved_cr3;
-
-    return;
 }
 
 #else /* !TARGET_X86_64 */