Add MIN() macro

Author: t-nelson

src/utils.h

@@ -8,6 +8,7 @@
 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
 
 #define MAX(a,b)      ((a) > (b) ? (a) : (b))
+#define MIN(a,b)      ((a) < (b) ? (a) : (b))
 
 int
 timespan_to_string(