fs: fuse: fix max() of incompatible types

The 'max()' value of a 'long long' and an 'unsigned int' is problematic
if the former is negative:

In function 'fuse_wr_pages',
    inlined from 'fuse_perform_write' at fs/fuse/file.c:1347:27:
include/linux/compiler_types.h:652:45: error: call to '__compiletime_assert_390' declared with attribute error: min(((pos + len - 1) >> 12) - (pos >> 12) + 1, max_pages) signedness error
  652 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
      |                                             ^

Use a temporary variable to make it clearer what is going on here.

Fixes: 0f5bb0c ("fs: use min() or umin() instead of min_t()")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Author: arndb

fs/fuse/file.c

@@ -1323,8 +1323,10 @@ static ssize_t fuse_fill_write_pages(struct fuse_io_args *ia,
 static inline unsigned int fuse_wr_pages(loff_t pos, size_t len,
 				     unsigned int max_pages)
 {
-	return min(((pos + len - 1) >> PAGE_SHIFT) - (pos >> PAGE_SHIFT) + 1,
-		   max_pages);
+	unsigned int pages = ((pos + len - 1) >> PAGE_SHIFT) -
+			     (pos >> PAGE_SHIFT) + 1;
+
+	return min(pages, max_pages);
 }
 
 static ssize_t fuse_perform_write(struct kiocb *iocb, struct iov_iter *ii)