Add const qualifiers to appropriate arguments of OSet routines.

Patch from Bart Van Assche <bart.vanassche@gmail.com>.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@7308 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/cachegrind/cg_main.c b/cachegrind/cg_main.c
index 9fae9de..45dfd70 100644
--- a/cachegrind/cg_main.c
+++ b/cachegrind/cg_main.c
@@ -112,7 +112,7 @@
 } LineCC;
 
 // First compare file, then fn, then line.
-static Word cmp_CodeLoc_LineCC(void *vloc, void *vcc)
+static Word cmp_CodeLoc_LineCC(const void *vloc, const void *vcc)
 {
    Word res;
    CodeLoc* a = (CodeLoc*)vloc;
@@ -182,7 +182,7 @@
 /*--- String table operations                              ---*/
 /*------------------------------------------------------------*/
 
-static Word stringCmp( void* key, void* elem )
+static Word stringCmp( const void* key, const void* elem )
 {
    return VG_(strcmp)(*(Char**)key, *(Char**)elem);
 }