block: Introduce path_has_protocol() function
The bdrv_find_protocol() function returns NULL if an unknown protocol name is given. It returns the "file" protocol when the filename contains no protocol at all. This makes it difficult to distinguish between paths which contain a protocol and those which do not. Factor out a helper function that tests whether or not a filename has a protocol. The next patch makes use of this function. Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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