cleanup: resolve revive linter issue

revive linter checks for var-declaration
format.
For example:
"e2e/rbd_helper.go:441:36: var-declaration:
should drop = nil from declaration of
var noPVCValidation; it is the zero value (revive)
var noPVCValidation validateFunc = nil"

Updates: #1586

Signed-off-by: Yati Padia <ypadia@redhat.com>

internal/journal/voljournal.go

@@ -644,8 +644,8 @@ func (conn *Connection) GetImageAttributes(
 	snapSource bool) (*ImageAttributes, error) {
 	var (
 		err             error
-		imageAttributes *ImageAttributes = &ImageAttributes{}
-		cj                               = conn.config
+		imageAttributes = &ImageAttributes{}
+		cj              = conn.config
 	)
 
 	if snapSource && cj.cephSnapSourceKey == "" {