staging: lustre: Fix "unsigned"->"unsigned int"

This patch fixes the checkpatch.pl warning:

WARNING:UNSPECIFIED_INT: Prefer 'unsigned int' to bare use of 'unsigned'
Signed-off-by: Sabin Mihai Rapan <sabin.rapan@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/include/uapi/linux/lustre/lustre_fiemap.h

@@ -51,7 +51,7 @@ static inline size_t fiemap_count_to_size(size_t extent_count)
 				       sizeof(struct fiemap_extent);
 }
 
-static inline unsigned fiemap_size_to_count(size_t array_size)
+static inline unsigned int fiemap_size_to_count(size_t array_size)
 {
 	return (array_size - sizeof(struct fiemap)) /
 		sizeof(struct fiemap_extent);