staging: erofs: fix return type of erofs_workgroup_get

There exists a return type misuse (`int'->`bool') since all
users assume it fails if only return value != 0, let's fix
the return type to `int' instead of confusing `bool'.

No logic changes.
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/erofs/internal.h

@@ -252,7 +252,7 @@ static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp)
 }
 #endif
 
-static inline bool erofs_workgroup_get(struct erofs_workgroup *grp, int *ocnt)
+static inline int erofs_workgroup_get(struct erofs_workgroup *grp, int *ocnt)
 {
 	int o;