iscsi-private: add MIN and MAX macros

Signed-off-by: Peter Lieven <pl@kamp.de>

include/iscsi-private.h

@@ -33,6 +33,13 @@ extern "C" {
 #define discard_const(ptr) ((void *)((intptr_t)(ptr)))
 #endif
 
+#ifndef MIN
+#define MIN(a, b) (((a) < (b)) ? (a) : (b))
+#endif
+#ifndef MAX
+#define MAX(a, b) (((a) > (b)) ? (a) : (b))
+#endif
+
 #define ISCSI_RAW_HEADER_SIZE			48
 #define ISCSI_DIGEST_SIZE			 4