sdk/log: remove unnecessary b.q.Len() call (#6641)

Addresses
#6569 (comment)

Author: pellared

CHANGELOG.md

@@ -29,7 +29,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Initialize map with `len(keys)` in `NewAllowKeysFilter` and `NewDenyKeysFilter` to avoid unnecessary allocations in `go.opentelemetry.io/otel/attribute`. (#6455)
 - `go.opentelemetry.io/otel/log/logtest` is now a separate Go module. (#6465)
 - `go.opentelemetry.io/otel/sdk/log/logtest` is now a separate Go module. (#6466)
-- Improve performance of `BatchProcessor` in `go.opentelemetry.io/otel/sdk/log` by not exporting when exporter cannot accept more. (#6569)
+- Improve performance of `BatchProcessor` in `go.opentelemetry.io/otel/sdk/log` by not exporting when exporter cannot accept more. (#6569, #6641)
 
 ### Deprecated
 

sdk/log/batch.go

@@ -156,7 +156,7 @@ func (b *BatchProcessor) poll(interval time.Duration) (done chan struct{}) {
 				global.Warn("dropped log records", "dropped", d)
 			}
 
-			qLen := b.q.Len()
+			var qLen int
 			// Don't copy data from queue unless exporter can accept more, it is very expensive.
 			if b.exporter.Ready() {
 				qLen = b.q.TryDequeue(buf, func(r []Record) bool {
@@ -166,6 +166,8 @@ func (b *BatchProcessor) poll(interval time.Duration) (done chan struct{}) {
 					}
 					return ok
 				})
+			} else {
+				qLen = b.q.Len()
 			}
 
 			if qLen >= b.batchSize {