Call back with Error instead of string

Author: kevinsawicki

lib/minidump.js

@@ -51,7 +51,7 @@ module.exports.walkStack = function(minidump, symbolPaths, callback) {
 
   var stackwalk = searchCommand('minidump_stackwalk');
   if (!stackwalk) {
-    callback('Unable to find the "minidump_stackwalk"');
+    callback(new Error('Unable to find "minidump_stackwalk"'));
     return;
   }
 
@@ -62,7 +62,7 @@ module.exports.walkStack = function(minidump, symbolPaths, callback) {
 module.exports.dumpSymbol = function(binary, callback) {
   var dumpsyms = searchCommand('dump_syms');
   if (!dumpsyms) {
-    callback('Unable to find the "dump_syms"');
+    callback(new Error('Unable to find "dump_syms"'));
     return;
   }