Fix format string

PRIx64 already has the x inside, so this was creating a nonsensical format
string.

llvm-svn: 333273
diff --git a/lldb/source/Target/ThreadPlanStepOverBreakpoint.cpp b/lldb/source/Target/ThreadPlanStepOverBreakpoint.cpp
index 85bddd7..7497dbf 100644
--- a/lldb/source/Target/ThreadPlanStepOverBreakpoint.cpp
+++ b/lldb/source/Target/ThreadPlanStepOverBreakpoint.cpp
@@ -99,7 +99,7 @@
 
         if (pc_addr == m_breakpoint_addr) {
           if (log)
-            log->Printf("Got breakpoint stop reason but pc: %x" PRIx64 
+            log->Printf("Got breakpoint stop reason but pc: 0x%" PRIx64
                         "hasn't changed.", pc_addr);
           return true;
         }