chore(all): replace map key deletion loop with clear() (#21082)

cmd/bucket-metadata-sys.go

@@ -647,9 +647,7 @@ func (sys *BucketMetadataSys) init(ctx context.Context, buckets []string) {
 // Reset the state of the BucketMetadataSys.
 func (sys *BucketMetadataSys) Reset() {
 	sys.Lock()
-	for k := range sys.metadataMap {
-		delete(sys.metadataMap, k)
-	}
+	clear(sys.metadataMap)
 	sys.Unlock()
 }
 

cmd/tier.go

@@ -491,13 +491,9 @@ func (config *TierConfigMgr) Reload(ctx context.Context, objAPI ObjectLayer) err
 	}
 
 	// Reset drivercache built using current config
-	for k := range config.drivercache {
-		delete(config.drivercache, k)
-	}
+	clear(config.drivercache)
 	// Remove existing tier configs
-	for k := range config.Tiers {
-		delete(config.Tiers, k)
-	}
+	clear(config.Tiers)
 	// Copy over the new tier configs
 	for tier, cfg := range newConfig.Tiers {
 		config.Tiers[tier] = cfg

cmd/xl-storage.go

@@ -3373,9 +3373,7 @@ func (s *xlStorage) CleanAbandonedData(ctx context.Context, volume string, path
 	}
 
 	// Clear and repopulate
-	for k := range foundDirs {
-		delete(foundDirs, k)
-	}
+	clear(foundDirs)
 
 	// Populate into map
 	for _, k := range dirs {