net: cosmetic: net.c checkpatch compliance

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/include/common.h b/include/common.h
index 4b5841e..7338e39 100644
--- a/include/common.h
+++ b/include/common.h
@@ -794,6 +794,10 @@
 
 #include <bootstage.h>
 
+#ifdef CONFIG_SHOW_ACTIVITY
+void show_activity(int arg);
+#endif
+
 /* Multicore arch functions */
 #ifdef CONFIG_MP
 int cpu_status(int nr);