Initialize type to a known invalid value so

the logging message is clearer when an unknown
type is found in the main bin spec.

Author: jasonmolenda

lldb/source/Plugins/ObjectFile/Mach-O/ObjectFileMachO.cpp

@@ -5656,6 +5656,7 @@ bool ObjectFileMachO::GetCorefileMainBinaryInfo(addr_t &value,
           // convert the "main bin spec" type into our
           // ObjectFile::BinaryType enum
           const char *typestr = "unrecognized type";
+          type = eBinaryTypeInvalid;
           switch (binspec_type) {
           case 0:
             type = eBinaryTypeUnknown;