cleanup: resolve nlreturn linter issues

nlreturn linter requires a new line before return
and branch statements except when the return is alone
inside a statement group (such as an if statement) to
increase code clarity. This commit addresses such issues.

Updates: #1586

Signed-off-by: Rakshith R <rar@redhat.com>

e2e/kms.go

@@ -104,5 +104,6 @@ func (vc *vaultConfig) getPassphrase(f *framework.Framework, key string) (string
 		LabelSelector: "app=vault",
 	}
 	stdOut, stdErr := execCommandInPodAndAllowFail(f, cmd, cephCSINamespace, &opt)
+
 	return strings.TrimSpace(stdOut), strings.TrimSpace(stdErr)
 }