unittests: fix -Wnarrowing build errors

src/common/dwarf/dwarf2diehandler.h

Index: src/common/dwarf/dwarf2diehandler.h
diff --git a/src/common/dwarf/dwarf2diehandler.h b/src/common/dwarf/dwarf2diehandler.h
index 81f40f072f14a6de6a68a85537c8012795f569ed..a1e589a863e08d8ad9b87eddf1af4903e262eb9f 100644
--- a/src/common/dwarf/dwarf2diehandler.h
+++ b/src/common/dwarf/dwarf2diehandler.h
@@ -156,6 +156,8 @@
 #ifndef COMMON_DWARF_DWARF2DIEHANDLER_H__
 #define COMMON_DWARF_DWARF2DIEHANDLER_H__
 
+#include <stdint.h>
+
 #include <stack>
 #include <string>
 
@@ -206,7 +208,7 @@ class DIEHandler {
                                          uint64 data) { }
   virtual void ProcessAttributeBuffer(enum DwarfAttribute attr,
                                       enum DwarfForm form,
-                                      const char* data,
+                                      const uint8_t *data,
                                       uint64 len) { }
   virtual void ProcessAttributeString(enum DwarfAttribute attr,
                                       enum DwarfForm form,
@@ -309,7 +311,7 @@ class DIEDispatcher: public Dwarf2Handler {
   void ProcessAttributeBuffer(uint64 offset,
                               enum DwarfAttribute attr,
                               enum DwarfForm form,
-                              const char* data,
+                              const uint8_t *data,
                               uint64 len);
   void ProcessAttributeString(uint64 offset,
                               enum DwarfAttribute attr,