Fix compiler warnings: Explicit cast where needed

Author: bdd

lib/blisp.c

@@ -192,8 +192,8 @@ blisp_return_t blisp_device_handshake(struct blisp_device* device,
     sleep_ms(50);  // Wait a bit so BootROM can init
   }
 
-  uint32_t bytes_count = device->chip->handshake_byte_multiplier *
-                         (float)device->current_baud_rate / 10.0f;
+  uint32_t bytes_count = (uint32_t)(device->chip->handshake_byte_multiplier *
+                                    (float)device->current_baud_rate / 10.0f);
   if (bytes_count > 600)
     bytes_count = 600;
   memset(handshake_buffer, 'U', bytes_count);