DWARF: correct cast (NFC)

Change the case of a PRIu64 value from `long` to `uint64_t`.  NFC.

git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@292728 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/src/DwarfParser.hpp b/src/DwarfParser.hpp
index 9a75555..f4e5d48 100644
--- a/src/DwarfParser.hpp
+++ b/src/DwarfParser.hpp
@@ -674,7 +674,7 @@
         reg = operand;
         results->savedRegisters[reg] = initialState.savedRegisters[reg];
         _LIBUNWIND_TRACE_DWARF("DW_CFA_restore(reg=%" PRIu64 ")\n",
-                               static_cast<long>(operand));
+                               static_cast<uint64_t>(operand));
         break;
       default:
         _LIBUNWIND_TRACE_DWARF("unknown CFA opcode 0x%02X\n", opcode);