Rename "cert" variable to improve code clarity in pemToPrivateKey function

[y12studio]

Description:

In the pemToPrivateKey function, the variable name "cert" is used to store the result of derToPrivateKey(block.Bytes). This naming is confusing because:

1. The variable doesn't actually contain a certificate.
2. The function is meant to return a private key, not a certificate.

Proposed change:

Rename the "cert" variable to "privateKey" or "key" to accurately reflect its contents.

• fabric-lib-go/bccsp/sw/keys.go

  Line 261 in 25edd1e

  cert, err := derToPrivateKey(block.Bytes)

• fabric-lib-go/bccsp/sw/keys.go

  Line 453 in 25edd1e

  cert, err := derToPublicKey(block.Bytes)

Current code:

cert, err := derToPrivateKey(block.Bytes)
if err != nil {
    return nil, err
}
return cert, err

Suggested code:

key, err := derToPrivateKey(block.Bytes)
if err != nil {
    return nil, err
}
return key, err

Impact:

This change does not affect the functionality of the code. It's purely a readability improvement that will enhance developer experience and reduce potential confusion when maintaining or reviewing this code.