fix platform's bug

HMCLAPI/src/main/java/org/jackhuang/hellominecraft/utils/OS.java

@@ -62,7 +62,7 @@ public enum OS {
             OperatingSystemMXBean o = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
             return o.getTotalPhysicalMemorySize();
         } catch(Throwable t) {
-            HMCLog.warn("Failed to get total physical memory size", t);
+            HMCLog.warn("Failed to get total physical memory size");
             return -1;
         }
     }

HMCLAPI/src/main/java/org/jackhuang/hellominecraft/utils/Platform.java

@@ -50,7 +50,6 @@ public enum Platform {
     public abstract String getBit();
     
     public static Platform getPlatform() {
-	String arch = System.getProperty("os.arch");
-	return arch.contains("64") ? Platform.BIT_64 : Platform.BIT_32;
+	return System.getProperty("os.arch").contains("64") ? BIT_64 : BIT_32;
     }
 }