close all ReadClosers explicitly retrieved from resolvers

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

internal/err_helper.go

@@ -0,0 +1,14 @@
+package internal
+
+import (
+	"io"
+
+	"github.com/anchore/syft/internal/log"
+)
+
+// CloseAndLogError closes the given io.Closer and reports any errors found as a warning in the log
+func CloseAndLogError(closer io.Closer, location string) {
+	if err := closer.Close(); err != nil {
+		log.Warnf("unable to close file for location=%q: %+v", location, err)
+	}
+}