signedness issues in testsuite

Fixes gcc-4 warnings.

Jan

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Index: testsuite/latency/latency.c
===================================================================

latency/latency.c +3 -3

@@ -40,9 +40,9 @@
 #define WARMUP_TIME 1
 #define HISTOGRAM_CELLS 100
 int histogram_size = HISTOGRAM_CELLS;
-unsigned long *histogram_avg = NULL,
-    *histogram_max = NULL,
-    *histogram_min = NULL;
+long *histogram_avg = NULL,
+     *histogram_max = NULL,
+     *histogram_min = NULL;
 
 int do_histogram = 0, do_stats = 0, finished = 0;
 int bucketsize = 1000;  /* default = 1000ns, -B <size> to override */

Index: testsuite/klatency/latency.c
===================================================================

klatency/latency.c +3 -4

@@ -12,9 +12,9 @@
 
 #define HISTOGRAM_CELLS 200
 int histogram_size = HISTOGRAM_CELLS;
-unsigned long *histogram_avg = NULL,
-              *histogram_max = NULL,
-              *histogram_min = NULL;
+long *histogram_avg = NULL,
+     *histogram_max = NULL,
+     *histogram_min = NULL;
 
 int do_histogram = 0, do_stats = 0, finished = 0;
 int bucketsize = 1000;		/* bucketsize */
 
 
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