fix: USB mass storage polish

kernel/src/Drivers/USB/MassStorage.cpp

@@ -358,10 +358,10 @@ namespace Drivers::USB::MassStorage {
         uint8_t cdb[6] = {};
         cdb[0] = SCSI_TEST_UNIT_READY;
 
-        for (int i = 0; i < 20; i++) {
+        for (int i = 0; i < 5; i++) {
             if (ScsiCommand(dev, cdb, 6, nullptr, 0, 0, false)) return true;
             RequestSense(dev);
-            PollWaitMs(100);
+            PollWaitMs(50);
         }
 
         return false;

kernel/src/Drivers/USB/Xhci.cpp

@@ -578,8 +578,8 @@ namespace Drivers::USB::Xhci {
             }
         }
 
-        KernelLogStream(WARNING, "xHCI") << "Control transfer timeout on slot " << base::dec << (uint64_t)slotId;
-
+        // Callers already log their own error with request context; the xHCI
+        // layer just returns 0xFF and recovers EP0 so the next transfer works.
         // Recover EP0 ring: Stop Endpoint, then Set TR Dequeue Pointer
         // so that subsequent control transfers on this slot still work.
         TRB stopTrb = {};