Polish more fcsl->lsegs vs. fdsl->lsegs possible confusion

src/fellow_cache.c

@@ -2123,6 +2123,7 @@ fellow_busy_obj_alloc(struct fellow_cache *fc,
 
 	AN(fbo->body_seglist);
 	AN(fbo->body_seglist->lsegs);
+	AN(fbo->body_seglist->fdsl->lsegs);
 	AZ(fbo->body_seglist->fdsl->nsegs);
 
 	/* keep one io outstanding until unbusy is called
@@ -4198,7 +4199,8 @@ fellow_busy_obj_getspace(struct fellow_busy *fbo, size_t *sz, uint8_t **ptr)
 	AN(fbo->body_seglist);
 	AN(fbo->body_seglist->fdsl);
 	fbo->body_seglist->fdsl->nsegs++;
-	assert(fbo->body_seglist->fdsl->nsegs <= fbo->body_seglist->lsegs);
+	assert(fbo->body_seglist->fdsl->nsegs <=
+	    fbo->body_seglist->fdsl->lsegs);
 
 	*sz = spc;
 	*ptr = fcs->alloc.ptr;