softmmu/trace-events: Fix a typo

Commit 8af3f5c6d6 ("softmmu: add trace point when bdrv_flush_all
fails") added calls to trace_vm_stop_flush_all() in 'cpus.c'.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20231004090629.37473-2-philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

softmmu/trace-events

@@ -21,7 +21,7 @@ flatview_destroy(void *view, void *root) "%p (root %p)"
 flatview_destroy_rcu(void *view, void *root) "%p (root %p)"
 global_dirty_changed(unsigned int bitmask) "bitmask 0x%"PRIx32
 
-# softmmu.c
+# cpus.c
 vm_stop_flush_all(int ret) "ret %d"
 
 # vl.c