Allowing read() to continue after socket close if data is still available

Only for modules that buffer the data internally

src/TinyGsmClientSIM800.h

@@ -135,7 +135,7 @@ public:
     TINY_GSM_YIELD();
     at->maintain();
     size_t cnt = 0;
-    while (cnt < size && sock_connected) {
+    while (cnt < size) {
       size_t chunk = TinyGsmMin(size-cnt, rx.size());
       if (chunk > 0) {
         rx.get(buf, chunk);