修复64位无法dump

Bcore/src/main/jni/DexDump.cpp

@@ -64,9 +64,10 @@ void DexDump::dumpDex(JNIEnv *env, jlong cookie, jstring dir) {
     auto dirC = env->GetStringUTFChars(dir, 0);
 
     auto dexSizeOffset = ((unsigned long ) begin) + 0x20;
-    size_t size = *(size_t *) dexSizeOffset;
+    int size = *(size_t *) dexSizeOffset;
 
     auto buffer = malloc(size);
+    if (buffer) {
         memcpy(buffer, reinterpret_cast<const void *>(begin), size);
         // fix magic
         memcpy(buffer, magic, sizeof(magic));
@@ -84,4 +85,5 @@ void DexDump::dumpDex(JNIEnv *env, jlong cookie, jstring dir) {
         close(fd);
         free(buffer);
         env->ReleaseStringUTFChars(dir, dirC);
+    }
 }