Fix botched disassembler backport

util/vbu.c

@@ -5,28 +5,28 @@
 #include <string.h>
 #include <vbu.h>
 
-/* Memory management */
-#ifndef VBU_REALLOC
-    #include <stdlib.h>
-    #define VBU_REALLOC realloc
-#else
-    extern void* VBU_REALLOC(void *, size_t);
-#endif
-
 
 
 /***************************** Library Functions *****************************/
 
-/* Sign-extend an integer of variable width */
-static int32_t SignExtend(int32_t value, int32_t bits) {
-    #ifndef VB_SIGNED_PROPAGATE
-        value &= ~((uint32_t) 0xFFFFFFFF << bits);
-        bits   = (int32_t) 1 << (bits - (int32_t) 1);
-        return (value ^ bits) - bits;
-    #else
-        return value << (32 - bits) >> (32 - bits);
-    #endif
+/* Memory manager */
+#ifdef VBU_MEMMGR
+extern void* VBU_MEMMGR(void *ptr, size_t size);
+#else
+#include <stdlib.h>
+static void* VBU_MEMMGR(void *ptr, size_t size) {
+
+    /* Free a buffer */
+    if (size == 0) {
+        if (ptr != NULL)
+            free(ptr);
+        return NULL;
+    }
+
+    /* Create or resize a buffer */
+    return realloc(ptr, size);
 }
+#endif