net/9p/protocol.c: Fix a memory leak

When p9pdu_readf() is called with "s" attribute, it allocates a pointer that
will store a string. In p9dirent_read(), this pointer is not being released,
leading to out of memory errors.
This patch releases this pointer after string is copyed to dirent->d_name.
Signed-off-by: NPedro Scarapicchia Junior <pedro.scarapiccha@br.flextronics.com>
Signed-off-by: NEric Van Hensbergen <ericvh@gmail.com>

net/9p/protocol.c

@@ -674,6 +674,7 @@ int p9dirent_read(char *buf, int len, struct p9_dirent *dirent,
 	}
 
 	strcpy(dirent->d_name, nameptr);
+	kfree(nameptr);
 
 out:
 	return fake_pdu.offset;