[Bell] Added delay to halting while loops

examples/BellModem/BellModem_Transmit/BellModem_Transmit.ino

@@ -52,7 +52,7 @@ void setup() {
   } else {
     Serial.print(F("failed, code "));
     Serial.println(state);
-    while(true);
+    while (true) { delay(10); }
   }
 
   // initialize Bell 202 modem
@@ -63,7 +63,7 @@ void setup() {
   } else {
     Serial.print(F("failed, code "));
     Serial.println(state);
-    while(true);
+    while (true) { delay(10); }
   }
 }