Add an explicit cast to avoid a warning

... with -Wsign-compare.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/buffer.c b/lib/buffer.c
index cdb494c..79c18fd 100644
--- a/lib/buffer.c
+++ b/lib/buffer.c
@@ -54,7 +54,7 @@ _ul_buffer_realloc_to_reserve (ul_buffer_t *buffer, size_t size)
 static inline int
 _ul_buffer_reserve_size (ul_buffer_t *buffer, size_t size)
 {
-  if (buffer->alloc_end - buffer->ptr < size)
+  if ((size_t)(buffer->alloc_end - buffer->ptr) < size)
     return _ul_buffer_realloc_to_reserve (buffer, size);
   return 0;
 }