Fix a comparison of integers of different signs warning

[ttsugrii]

Summary

source/Plugins/DynamicLoader/Darwin-Kernel/DynamicLoaderDarwinKernel.cpp:403:21: warning: comparison of integers of different signs: 'int' and 'size_t' (aka 'unsigned long') [-Wsign-compare]
for (int i = 0; i < llvm::array_lengthof (magicks); i++)
                ~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[inglorion]

lgtm

lldb/trunk/source/Plugins/DynamicLoader/Darwin-Kernel/DynamicLoaderDarwinKernel.cpp

DynamicLoaderDarwinKernel::CheckForKernelImageAtAddress(lldb::addr_t addr,
   Error read_error;
   uint8_t magicbuf[4];
   if (process->ReadMemoryFromInferior (addr, magicbuf, sizeof (magicbuf), read_error) != sizeof (magicbuf))
       return UUID();
 
   const uint32_t magicks[] = { llvm::MachO::MH_MAGIC_64, llvm::MachO::MH_MAGIC, llvm::MachO::MH_CIGAM, llvm::MachO::MH_CIGAM_64};
 
   bool found_matching_pattern = false;
-  for (int i = 0; i < llvm::array_lengthof (magicks); i++)
+  for (size_t i = 0; i < llvm::array_lengthof (magicks); i++)
     if (::memcmp (magicbuf, &magicks[i], sizeof (magicbuf)) == 0)
         found_matching_pattern = true;
 
   if (found_matching_pattern == false)
       return UUID();
 
   // Read the mach header and see whether it looks like a kernel
   llvm::MachO::mach_header header;