When iterating through a directory, a file's name may not be
null-terminated (depending on the underlying filesystem implementation).

Modify match_pattern to take the string's length into account when matching
it against the request pattern.
Signed-off-by: NMarios Makassikis <mmakassikis@freebox.fr>
Signed-off-by: NNamjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: NSteve French <stfrench@microsoft.com>