Extra redundant error check

[Miks Kalniņš]

I was just checking the source to understand how it interacts with Postmark API and I noticed this:

terraform-provider-postmark/postmark/resource_server.go

Line 110 in 16f3877

 if err != nil { 

Not a big deal, just letting you know.

Edit:

Seems like it's repeated multiple times:

terraform-provider-postmark/postmark/resource_server.go

Line 151 in 16f3877

 if err != nil { 

etc

[Alaa]

Thank you, will be fixed soon.