core: balloon: Add balloon_free() function

Signed-off-by: Chloe M. <chloe@mirocom.org>

mvm/core/balloon_subr.c

@@ -73,3 +73,16 @@ balloon_memcpy(struct mvm_balloon *dest, off_t off, void *source, size_t count)
     memcpy((char *)dest->data + off, source, count);
     return 0;
 }
+
+void
+balloon_free(struct mvm_balloon *bp)
+{
+    if (bp == NULL) {
+        return;
+    }
+
+    if (bp->data != NULL) {
+        free(bp->data);
+        bp->data = NULL;
+    }
+}

mvm/include/mvm/balloon.h

@@ -50,4 +50,11 @@ int balloon_init(struct mvm_balloon *bp, size_t cap);
  */
 int balloon_memcpy(struct mvm_balloon *dest, off_t off, void *source, size_t count);
 
+/*
+ * Release a balloon from memory
+ *
+ * @bp: Balloon to free
+ */
+void balloon_free(struct mvm_balloon *bp);
+
 #endif  /* !MVM_BALLOON_H */