hostfs: fix mismatch between link_file definition and declaration

The function link_file declaration in the header file has the order
of the two arguments (from, to) swapped when compared to the definition
arguments of (to, from).  Fix this by swapping them around to match
the definition.

This error predates the git history, so no idea when this error
was introduced.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

fs/hostfs/hostfs.h

@@ -87,7 +87,7 @@ extern int do_mkdir(const char *file, int mode);
 extern int hostfs_do_rmdir(const char *file);
 extern int do_mknod(const char *file, int mode, unsigned int major,
 		    unsigned int minor);
-extern int link_file(const char *from, const char *to);
+extern int link_file(const char *to, const char *from);
 extern int hostfs_do_readlink(char *file, char *buf, int size);
 extern int rename_file(char *from, char *to);
 extern int rename2_file(char *from, char *to, unsigned int flags);