Merge pull request #4233 from lioncash/debug

kernel/svc: Do nothing if svcOutputDebugString's length is <= 0

src/core/hle/kernel/svc.cpp

@@ -662,6 +662,10 @@ static void Break(u8 break_reason) {
 
 /// Used to output a message on a debug hardware unit - does nothing on a retail unit
 static void OutputDebugString(VAddr address, int len) {
+    if (len <= 0) {
+        return;
+    }
+
     std::string string(len, ' ');
     Memory::ReadBlock(address, string.data(), len);
     LOG_DEBUG(Debug_Emulated, "{}", string);