Refactor LoadFrmware() to avoid global variables, which don't work when running out of ROM

host/linktest/main.c

 #include <stdio.h>
 
 #include "host_common.h"
 
 int main(void)
 {
   /* host_key.h */
   PrivateKeyRead(0, 0);
   PrivateKeyFree(0);
-  PublicKeyInit(0, 0, 0);
   PublicKeyAlloc(0, 0, 0);
-  PublicKeyCopy(0, 0);
   PublicKeyRead(0);
   PublicKeyReadKeyb(0, 0, 0);
   PublicKeyWrite(0, 0);
 
   /* host_keyblock.h */
   KeyBlockCreate(0, 0, 0);
   KeyBlockRead(0);
   KeyBlockWrite(0, 0);
 
   /* host_misc.h */
   ReadFile(0, 0);
   WriteFile(0, 0, 0);
 
   /* host_signature.h */
   SignatureInit(0, 0, 0, 0);
   SignatureAlloc(0, 0);
   SignatureCopy(0, 0);
   CalculateChecksum(0, 0);
   CalculateSignature(0, 0, 0);
 
   /* host_common.h */
   CreateFirmwarePreamble(0, 0, 0, 0);
   CreateKernelPreamble(0, 0, 0, 0, 0, 0, 0);
 
   return 0;
 }