Patches to fix problems on Windows

sql/log_event.cc:
  Adding cast since byte is unsigned char on Windows
sql/rpl_utility.cc:
  Adding missing return statement.

sql/log_event.cc

@@ -5369,7 +5369,7 @@ unpack_row(RELAY_LOG_INFO *rli,
     if (master_reclength)
     {
       if (*field_ptr)
-        *master_reclength = (*field_ptr)->ptr - table->record[0];
+        *master_reclength = (*field_ptr)->ptr - (char*) table->record[0];
       else
         *master_reclength = table->s->reclength;
     }

sql/rpl_utility.cc

@@ -96,6 +96,8 @@ field_length_from_packed(enum_field_types const field_type,
     length= ~0UL;                               // NYI
     break;
   }
+
+  return length;
 }
 
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