fix compiler warnings


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@1823 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/vg_default.c b/coregrind/vg_default.c
index 1bb5408..5d8043b 100644
--- a/coregrind/vg_default.c
+++ b/coregrind/vg_default.c
@@ -45,7 +45,7 @@
  * make it very clear what went wrong! */
 
 static __attribute__ ((noreturn))
-void fund_panic ( Char* fn )
+void fund_panic ( const Char* fn )
 {
    VG_(printf)(
       "\nSkin error:\n"
@@ -56,7 +56,7 @@
 }
 
 static __attribute__ ((noreturn))
-void non_fund_panic ( Char* fn )
+void non_fund_panic ( const Char* fn )
 {
    VG_(printf)(
       "\nSkin error:\n"
@@ -67,7 +67,7 @@
 }
 
 static __attribute__ ((noreturn))
-void malloc_panic ( Char* fn )
+void malloc_panic ( const Char* fn )
 {
    VG_(printf)(
       "\nSkin error:\n"