Change some ints to unsigned ints

Fixes some gratuitous warnings when compiling via C with -fhpc

includes/RtsExternal.h

@@ -73,13 +73,13 @@ extern void*  createAdjustor(int cconv, StgStablePtr hptr, StgFunPtr wptr,
 extern void   freeHaskellFunctionPtr(void* ptr);
 
 /* Hpc stuff */
-extern int hs_hpc_module(char *modName,int modCount,int modHashNo,StgWord64 *tixArr);
+extern int hs_hpc_module(char *modName,unsigned int modCount,unsigned int modHashNo,StgWord64 *tixArr);
 // Simple linked list of modules
 typedef struct _HpcModuleInfo {
   char *modName;		// name of module
-  int tickCount;		// number of ticks
-  int tickOffset;		// offset into a single large .tix Array
-  int hashNo;			// Hash number for this module's mix info
+  unsigned int tickCount;	// number of ticks
+  unsigned int tickOffset;	// offset into a single large .tix Array
+  unsigned int hashNo;		// Hash number for this module's mix info
   StgWord64 *tixArr;		// tix Array; local for this module
   struct _HpcModuleInfo *next;
 } HpcModuleInfo;

rts/Hpc.c

@@ -101,7 +101,7 @@ static StgWord64 expectWord64(void) {
 
 static void
 readTix(void) {
-  int i;
+  unsigned int i;
   HpcModuleInfo *tmpModule;
 
   totalTixes = 0;
@@ -186,11 +186,11 @@ static void hpc_init(void) {
 
 int
 hs_hpc_module(char *modName,
-	      int modCount,
-	      int modHashNo,
+	      unsigned int modCount,
+	      unsigned int modHashNo,
 	      StgWord64 *tixArr) {
   HpcModuleInfo *tmpModule, *lastModule;
-  int i;
+  unsigned int i;
   int offset = 0;
   
   debugTrace(DEBUG_hpc,"hs_hpc_module(%s,%d)",modName,modCount);
@@ -266,7 +266,7 @@ startupHpc(void) {
 static void
 writeTix(FILE *f) {
   HpcModuleInfo *tmpModule;  
-  int i, inner_comma, outer_comma;
+  unsigned int i, inner_comma, outer_comma;
 
   outer_comma = 0;