home: move the assert back to the intended place

98d81cf moved the assertion at the beginning of home_dispatch_acquire(),
which is however before we even check for any ongoing operation, hence we
might hit it even in legitimate cases.

Let's move it back to after we check for any possibly ongoing operation, to
make it once again a safety check.

Follow-up to 98d81cf.
Resolves: #22443 and #24036

(cherry picked from commit e4ab2db)

Author: mrc0mmand

src/home/homed-home.c

@@ -2692,8 +2692,6 @@ static int home_dispatch_acquire(Home *h, Operation *o) {
         assert(o);
         assert(o->type == OPERATION_ACQUIRE);
 
-        assert(!h->current_operation);
-
         switch (home_get_state(h)) {
 
         case HOME_UNFIXATED:
@@ -2729,6 +2727,8 @@ static int home_dispatch_acquire(Home *h, Operation *o) {
                 return 0;
         }
 
+        assert(!h->current_operation);
+
         r = home_ratelimit(h, &error);
         if (r >= 0)
                 r = call(h, o->secret, for_state, &error);