obmc-console: Fix readability-else-after-return

```
/usr/bin/clang-tidy -checks=-*, readability-else-after-return -export-fixes /tmp/tmpzmyw6on0/tmpdk8wt96i.yaml -p=build /mnt/host/andrew/home/andrew/src/openbmc/obmc-console/test/test-ringbuffer-boundary-poll.c
/mnt/host/andrew/home/andrew/src/openbmc/obmc-console/build/../ringbuffer.c:131:4: error: do not use 'else' after 'return' [readability-else-after-return,-warnings-as-errors]
        } else {
          ^~~~~~
```

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Ic80538a64f061f9ed3d3d71293dcf4f3d99cb6e4
diff --git a/console-server.c b/console-server.c
index 1a1c4be..2750349 100644
--- a/console-server.c
+++ b/console-server.c
@@ -680,14 +680,11 @@
 			timersub(earliest, cur_time, &interval);
 			return ((interval.tv_sec * 1000) +
 				(interval.tv_usec / 1000));
-		} else {
-			/* return from poll immediately */
-			return 0;
-		}
-	} else {
-		/* poll indefinitely */
-		return -1;
-	}
+		} /* return from poll immediately */
+		return 0;
+
+	} /* poll indefinitely */
+	return -1;
 }
 
 static int call_pollers(struct console *console, struct timeval *cur_time)
@@ -800,10 +797,9 @@
 		if (rc < 0) {
 			if (errno == EINTR) {
 				continue;
-			} else {
-				warn("poll error");
-				break;
 			}
+			warn("poll error");
+			break;
 		}
 
 		/* process internal fd first */
diff --git a/ringbuffer.c b/ringbuffer.c
index 856e077..93e78c3 100644
--- a/ringbuffer.c
+++ b/ringbuffer.c
@@ -126,9 +126,8 @@
 {
 	if (rbc->pos <= rbc->rb->tail) {
 		return rbc->rb->tail - rbc->pos;
-	} else {
-		return rbc->rb->tail + rbc->rb->size - rbc->pos;
 	}
+	return rbc->rb->tail + rbc->rb->size - rbc->pos;
 }
 
 static size_t ringbuffer_space(struct ringbuffer_consumer *rbc)
diff --git a/socket-handler.c b/socket-handler.c
index d05fec3..f37dcb8 100644
--- a/socket-handler.c
+++ b/socket-handler.c
@@ -271,9 +271,8 @@
 		if (rc < 0) {
 			if (errno == EAGAIN || errno == EWOULDBLOCK) {
 				return POLLER_OK;
-			} else {
-				goto err_close;
 			}
+			goto err_close;
 		}
 		if (rc == 0) {
 			goto err_close;