stupid return mistake fix, and dropped the additional assertion check!

pkg/pool/pool.go

@@ -82,5 +82,6 @@ func (p *Pool) Put(s interface{}) {
 			continue
 		}
 		p.buckets[i].Put(slice.Slice(0, 0).Interface())
+		return
 	}
 }

scrape/scrape.go

@@ -662,11 +662,8 @@ mainLoop:
 				time.Since(last).Seconds(),
 			)
 		}
-		b, ok := sl.buffers.Get(sl.lastScrapeSize).([]byte)
-		if !ok {
-			b = make([]byte, 0, sl.lastScrapeSize)
-			level.Error(sl.l).Log("msg", "buffer pool type assertion error")
-		}
+
+		b := sl.buffers.Get(sl.lastScrapeSize).([]byte)
 		buf := bytes.NewBuffer(b)
 
 		scrapeErr := sl.scraper.scrape(scrapeCtx, buf)