perf probe: Fix to get the DW_AT_decl_file and DW_AT_call_file as unsinged data

DWARF version 5 standard Sec 2.14 says that

Any debugging information entry representing the declaration of an object,
module, subprogram or type may have DW_AT_decl_file, DW_AT_decl_line and
DW_AT_decl_column attributes, each of whose value is an unsigned integer
constant.

So it should be an unsigned integer data. Also, even though the standard
doesn't clearly say the DW_AT_call_file is signed or unsigned, the
elfutils (eu-readelf) interprets it as unsigned integer data and it is
natural to handle it as unsigned integer data as same as DW_AT_decl_file.
This changes the DW_AT_call_file as unsigned integer data too.

Fixes: 3f4460a28fb2f73d ("perf probe: Filter out redundant inline-instances")
Signed-off-by: Masami Hiramatsu <[e-mail]>
Acked-by: Namhyung Kim <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Masami Hiramatsu <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: [e-mail]
Cc: Steven Rostedt (VMware) <[e-mail]>
Link: https://lore.kernel.org/r/166761727445.480106.3738447577082071942.stgit@devnote3
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/dwarf-aux.c

···
 	return 0;
 }
 
-/* Get attribute and translate it as a sdata */
-static int die_get_attr_sdata(Dwarf_Die *tp_die, unsigned int attr_name,
-			      Dwarf_Sword *result)
-{
-	Dwarf_Attribute attr;
-
-	if (dwarf_attr_integrate(tp_die, attr_name, &attr) == NULL ||
-	    dwarf_formsdata(&attr, result) != 0)
-		return -ENOENT;
-
-	return 0;
-}
-
 /**
  * die_is_signed_type - Check whether a type DIE is signed or not
  * @tp_die: a DIE of a type
···
 /* Get the call file index number in CU DIE */
 static int die_get_call_fileno(Dwarf_Die *in_die)
 {
-	Dwarf_Sword idx;
+	Dwarf_Word idx;
 
-	if (die_get_attr_sdata(in_die, DW_AT_call_file, &idx) == 0)
+	if (die_get_attr_udata(in_die, DW_AT_call_file, &idx) == 0)
 		return (int)idx;
 	else
 		return -ENOENT;
···
 /* Get the declared file index number in CU DIE */
 static int die_get_decl_fileno(Dwarf_Die *pdie)
 {
-	Dwarf_Sword idx;
+	Dwarf_Word idx;
 
-	if (die_get_attr_sdata(pdie, DW_AT_decl_file, &idx) == 0)
+	if (die_get_attr_udata(pdie, DW_AT_decl_file, &idx) == 0)
 		return (int)idx;
 	else
 		return -ENOENT;