Reindent a few lines to fix a GCC warning.

As of GCC 11.1.1, the compiler warns us about code like this:

     if (a)
         b;
         c;

and that's a good thing: we wouldn't want to "goto fail".  But we
had an instance if this in circuituse.c, which was making our
compilation sad.

Fixes bug 40380; bugfix on 0.3.0.1-alpha.

changes/bug40380

@@ -0,0 +1,3 @@
+  o Minor bugfixes (compiler warnings):
+    - Fix an indentation problem that led to a warning from  GCC 11.1.1.
+      Fixes bug 40380; bugfix on 0.3.0.1-alpha.