pkg/tsdb/cloudwatch/credentials.go: Remove unnecessary variable assignment
pkg/tsdb/cloudwatch/credentials.go: Remove unnecessary variable assignment

See,
pkg/tsdb/cloudwatch/credentials.go:45:2:warning: should merge variable declaration with assignment on next line (S1021) (megacheck)

grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana