lib/azure_blob_req: fix small leak in Get Blob Props
lib/azure_blob_req: fix small leak in Get Blob Props

Don't leak the x-ms-blob-type response value string.

Signed-off-by: David Disseldorp <589a549dc9f982d9f46aeeb82a09ab6d87ccf1d8@suse.de>

ddiss/elasto,ddiss/elasto