cloud/agent: remove unnecessary convertions

Change-Id: Ia67bbc3d80e499267a6c39211eea8c1b7c4da28a
Reviewed-on: https://review.monogon.dev/c/monogon/+/2998
Reviewed-by: Serge Bazanski <serge@monogon.tech>
Tested-by: Jenkins CI
diff --git a/cloud/agent/hwreport.go b/cloud/agent/hwreport.go
index c92244d..980dda1 100644
--- a/cloud/agent/hwreport.go
+++ b/cloud/agent/hwreport.go
@@ -376,7 +376,7 @@
 						c.errors = append(c.errors, fmt.Errorf("nic %v: failed to parse %q as integer: %w", l.Attrs().Name, modeParts[1], err))
 						continue
 					}
-					speeds[int64(speedMegabits)*mbps] = true
+					speeds[speedMegabits*mbps] = true
 				}
 			}
 			for s := range speeds {