Increase MAX_INTENSITY to 42.

Untested, since I do not have the hardware that supports such high a setting.

Requested by yellowz06 on Litecoin Forum:
https://forum.litecoin.net/index.php/topic,6925.msg54952.html#msg54952

driver-opencl.c

@@ -536,7 +536,7 @@ char *set_intensity(char *arg)
 	else {
 		gpus[device].dynamic = false;
 		val = atoi(nextptr);
-		if (val < MIN_INTENSITY || val > MAX_GPU_INTENSITY)
+		if (val < MIN_INTENSITY || val > MAX_INTENSITY)
 			return "Invalid value passed to set intensity";
 		tt = &gpus[device].intensity;
 		*tt = val;
@@ -550,7 +550,7 @@ char *set_intensity(char *arg)
 		else {
 			gpus[device].dynamic = false;
 			val = atoi(nextptr);
-			if (val < MIN_INTENSITY || val > MAX_GPU_INTENSITY)
+			if (val < MIN_INTENSITY || val > MAX_INTENSITY)
 				return "Invalid value passed to set intensity";
 
 			tt = &gpus[device].intensity;

miner.h

@@ -1049,9 +1049,8 @@ extern bool add_pool_details(struct pool *pool, bool live, char *url, char *user
 
 #define MIN_INTENSITY 8
 #define MIN_INTENSITY_STR "8"
-#define MAX_INTENSITY 20
-#define MAX_INTENSITY_STR "20"
-#define MAX_GPU_INTENSITY 20
+#define MAX_INTENSITY 42
+#define MAX_INTENSITY_STR "42"
 
 extern bool hotplug_mode;
 extern int hotplug_time;