Two minor bugs

[Lingzhu Xiang]

I found your code useful. Here are two bugs I found during hacking.

If I define a accessor member of bit field like unsigned int useSecurity:1, the accessor returns 0xffffffff for actual value 1. The bug is in magic3.hpp:

-if (((bitfield_mask+1)>>1)&unsignedT) //negative
+if ( ((T)-1) < 0 && (((bitfield_mask+1)>>1)&unsignedT)) //negative if T is signed

The second bug is in ssltrace_debug, vfprintf(stderr, should use vfprintf(ssltrace_log_handle(),.