bcachefs: Use correct fgf_t type as function argument

This quiets a sparse complaint.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/fs-io-pagecache.c

@@ -13,7 +13,7 @@
 
 int bch2_filemap_get_contig_folios_d(struct address_space *mapping,
 				     loff_t start, u64 end,
-				     int fgp_flags, gfp_t gfp,
+				     fgf_t fgp_flags, gfp_t gfp,
 				     folios *fs)
 {
 	struct folio *f;

fs/bcachefs/fs-io-pagecache.h

@@ -7,7 +7,7 @@
 typedef DARRAY(struct folio *) folios;
 
 int bch2_filemap_get_contig_folios_d(struct address_space *, loff_t,
-				     u64, int, gfp_t, folios *);
+				     u64, fgf_t, gfp_t, folios *);
 int bch2_write_invalidate_inode_pages_range(struct address_space *, loff_t, loff_t);
 
 /*