provider/aws: Remove unsafe ptr dereferencing [A-C]*

[radeksimko]

See full explanation & motivation in #8512 (comment)

Test plan

make testacc TEST=./builtin/providers/aws TESTARGS='-run="AWS(APIGatewayDomainName|CloudTrail|CloudWatchLogGroup|CodeCommitRepository|CodeDeployApp|CodeDeployDeploymentGroup)"'

TF_ACC=1 go test ./builtin/providers/aws -v -run="AWS(APIGatewayDomainName|CloudTrail|CloudWatchLogGroup|CodeCommitRepository|CodeDeployApp|CodeDeployDeploymentGroup)" -timeout 120m
=== RUN   TestAccAWSCloudTrail_importBasic
--- PASS: TestAccAWSCloudTrail_importBasic (70.02s)
=== RUN   TestAccAWSCloudWatchLogGroup_importBasic
--- PASS: TestAccAWSCloudWatchLogGroup_importBasic (18.06s)
=== RUN   TestAccAWSAPIGatewayDomainName_basic
--- PASS: TestAccAWSAPIGatewayDomainName_basic (19.96s)
=== RUN   TestAccAWSCloudTrail_basic
--- PASS: TestAccAWSCloudTrail_basic (107.62s)
=== RUN   TestAccAWSCloudTrail_enable_logging
--- PASS: TestAccAWSCloudTrail_enable_logging (147.01s)
=== RUN   TestAccAWSCloudTrail_is_multi_region
--- PASS: TestAccAWSCloudTrail_is_multi_region (140.15s)
=== RUN   TestAccAWSCloudTrail_logValidation
--- PASS: TestAccAWSCloudTrail_logValidation (100.66s)
=== RUN   TestAccAWSCloudTrail_tags
--- PASS: TestAccAWSCloudTrail_tags (158.60s)
=== RUN   TestAccAWSCloudWatchLogGroup_basic
--- PASS: TestAccAWSCloudWatchLogGroup_basic (17.04s)
=== RUN   TestAccAWSCloudWatchLogGroup_retentionPolicy
--- PASS: TestAccAWSCloudWatchLogGroup_retentionPolicy (35.15s)
=== RUN   TestAccAWSCloudWatchLogGroup_multiple
--- PASS: TestAccAWSCloudWatchLogGroup_multiple (21.04s)
=== RUN   TestAccAWSCloudWatchLogGroup_disappears
--- PASS: TestAccAWSCloudWatchLogGroup_disappears (15.81s)
=== RUN   TestAccAWSCodeCommitRepository_basic
--- PASS: TestAccAWSCodeCommitRepository_basic (16.16s)
=== RUN   TestAccAWSCodeCommitRepository_withChanges
--- PASS: TestAccAWSCodeCommitRepository_withChanges (26.61s)
=== RUN   TestAccAWSCodeCommitRepository_create_default_branch
--- PASS: TestAccAWSCodeCommitRepository_create_default_branch (18.56s)
=== RUN   TestAccAWSCodeCommitRepository_create_and_update_default_branch
--- PASS: TestAccAWSCodeCommitRepository_create_and_update_default_branch (27.35s)
=== RUN   TestAccAWSCodeDeployApp_basic
--- PASS: TestAccAWSCodeDeployApp_basic (27.28s)
=== RUN   TestAccAWSCodeDeployDeploymentGroup_basic
--- PASS: TestAccAWSCodeDeployDeploymentGroup_basic (44.59s)
=== RUN   TestAccAWSCodeDeployDeploymentGroup_onPremiseTag
--- PASS: TestAccAWSCodeDeployDeploymentGroup_onPremiseTag (35.21s)
=== RUN   TestAccAWSCodeDeployDeploymentGroup_disappears
--- PASS: TestAccAWSCodeDeployDeploymentGroup_disappears (29.13s)
=== RUN   TestAccAWSCodeDeployDeploymentGroup_triggerConfiguration_basic
--- PASS: TestAccAWSCodeDeployDeploymentGroup_triggerConfiguration_basic (45.48s)
=== RUN   TestAccAWSCodeDeployDeploymentGroup_triggerConfiguration_multiple
--- PASS: TestAccAWSCodeDeployDeploymentGroup_triggerConfiguration_multiple (49.91s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    1171.446s

[stack72]

Lgtm!

[ghost]

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