Check return code from fwrite

BUG=http://code.google.com/p/v8/issues/detail?id=453
TEST=none
Review URL: http://codereview.chromium.org/458016

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3404 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/d8.cc

@@ -159,7 +159,11 @@ Handle<Value> Shell::Write(const Arguments& args) {
       printf(" ");
     }
     v8::String::Utf8Value str(args[i]);
-    fwrite(*str, sizeof(**str), str.length(), stdout);
+    int n = fwrite(*str, sizeof(**str), str.length(), stdout);
+    if (n != str.length()) {
+      printf("Error in fwrite\n");
+      exit(1);
+    }
   }
   return Undefined();
 }