Add err object to return when err is not nil

[teraken0509]

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References: #8076 (comment)

Changes proposed in this pull request:

• Add return err object
  • It help for find out why error occured
    Output from acceptance testing:

$ make testacc TEST=./aws TESTARGS='-run=TestAccAWSCloudWatchEventRule_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -parallel 20 -run=TestAccAWSCloudWatchEventRule_ -timeout 120m
=== RUN   TestAccAWSCloudWatchEventRule_importBasic
=== PAUSE TestAccAWSCloudWatchEventRule_importBasic
=== RUN   TestAccAWSCloudWatchEventRule_basic
=== PAUSE TestAccAWSCloudWatchEventRule_basic
=== RUN   TestAccAWSCloudWatchEventRule_prefix
=== PAUSE TestAccAWSCloudWatchEventRule_prefix
=== RUN   TestAccAWSCloudWatchEventRule_tags
=== PAUSE TestAccAWSCloudWatchEventRule_tags
=== RUN   TestAccAWSCloudWatchEventRule_full
=== PAUSE TestAccAWSCloudWatchEventRule_full
=== RUN   TestAccAWSCloudWatchEventRule_enable
=== PAUSE TestAccAWSCloudWatchEventRule_enable
=== CONT  TestAccAWSCloudWatchEventRule_importBasic
=== CONT  TestAccAWSCloudWatchEventRule_full
=== CONT  TestAccAWSCloudWatchEventRule_enable
=== CONT  TestAccAWSCloudWatchEventRule_prefix
=== CONT  TestAccAWSCloudWatchEventRule_tags
=== CONT  TestAccAWSCloudWatchEventRule_basic
--- PASS: TestAccAWSCloudWatchEventRule_prefix (27.46s)
--- PASS: TestAccAWSCloudWatchEventRule_full (29.50s)
--- PASS: TestAccAWSCloudWatchEventRule_importBasic (30.97s)
--- PASS: TestAccAWSCloudWatchEventRule_basic (46.56s)
--- PASS: TestAccAWSCloudWatchEventRule_enable (63.71s)
--- PASS: TestAccAWSCloudWatchEventRule_tags (66.83s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	66.906s

[bflad]

LGTM, thanks for fixing this @kterada0509 🚀

[ghost]

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