unzip.cpp: Check successful write with good()

std::ofstream::write might not throw an exception on failed write

src/modules/userinterface/legacymenu/mainscreens/unzip.cpp

@@ -97,6 +97,12 @@ int unzip::extract(const std::string &path) const
         try
         {
             out.write(buf, n);
+
+            if (!out.good())
+            {
+                GfLogError("Failed to write %d bytes\n", n);
+                return -1;
+            }
         }
         catch (const std::ios_base::failure &failure)
         {