Revert "Kill one indentation"

This reverts commit eaac258d.

The benefits in terms of readability are uncertain and YMMV, but
compilers seem to find it harder to optimize too:

   cmpl   $0x0,-0x205c(%rbp)
   sete   %al
   movzbl %al,%eax
   or     %rax,%rdx

Before the change it would translate to just:

   or     $0x1,%rax
   mov    %rax,%rdx

Spotted by @fgsch

bin/varnishd/cache/cache_backend_probe.c

@@ -271,7 +271,8 @@ vbp_poke(struct vbp_target *vt)
 		if (tmo > 0)
 			i = poll(pfd, 1, tmo);
 		if (i == 0 || tmo <= 0) {
-			vt->err_recv |= (i == 0);
+			if (i == 0)
+				vt->err_recv |= 1;
 			VTCP_close(&s);
 			return;
 		}