api: MakeBucket() should honor regions properly. (#4969)

Fixes #4967

cmd/bucket-handlers.go

@@ -380,11 +380,7 @@ func (api objectAPIHandlers) PutBucketHandler(w http.ResponseWriter, r *http.Req
 	}
 
 	// PutBucket does not have any bucket action.
-	s3Error := checkRequestAuthType(r, "", "", globalMinioDefaultRegion)
+	s3Error := checkRequestAuthType(r, "", "", serverConfig.GetRegion())
-	if s3Error == ErrInvalidRegion {
-		// Clients like boto3 send putBucket() call signed with region that is configured.
-		s3Error = checkRequestAuthType(r, "", "", serverConfig.GetRegion())
-	}
 	if s3Error != ErrNone {
 		writeErrorResponse(w, s3Error, r.URL)
 		return

cmd/gateway-handlers.go

@@ -603,11 +603,7 @@ func (api gatewayAPIHandlers) PutBucketHandler(w http.ResponseWriter, r *http.Re
 	}
 
 	// PutBucket does not have any bucket action.
-	s3Error := checkRequestAuthType(r, "", "", globalMinioDefaultRegion)
+	s3Error := checkRequestAuthType(r, "", "", serverConfig.GetRegion())
-	if s3Error == ErrInvalidRegion {
-		// Clients like boto3 send putBucket() call signed with region that is configured.
-		s3Error = checkRequestAuthType(r, "", "", serverConfig.GetRegion())
-	}
 	if s3Error != ErrNone {
 		writeErrorResponse(w, s3Error, r.URL)
 		return