free: Update tests and fix for previous patch

The previous two patches updated free, but needed a tweak and the tests
also needed to be updated. I've hand-calculated the results using bc and
both the testsuite and bc results equal what free prints out.

References:
 commit 9365be7633
 procps-ng/procps#45

free.c

@@ -133,7 +133,7 @@ static const char *scale_size(unsigned long size, int flags, struct commandline_
 		if (args.exponent > 1) {
 			/* In desired scale. */
 			snprintf(buf, sizeof(buf), "%ld",
-				 (long int)((size / 1024) * base / power(base, args.exponent - 2))
+                 (long int)((size * 1024) / power(base, args.exponent-1))
 			    );
 			return buf;
 		}