fix:Memory Management in FFI Error Handling (#614)

- When  fails, some error paths don't properly clean up allocated memory

Signed-off-by: OneZero-Y <aukovyps@163.com>

Author: OneZero-Y

candle-binding/src/ffi/embedding.rs

@@ -856,6 +856,10 @@ pub extern "C" fn calculate_embedding_similarity(
 
         if status1 != 0 || emb_result1.error {
             eprintln!("Error generating embedding for text1");
+            // Clean up allocated memory before returning
+            if !emb_result1.data.is_null() {
+                crate::ffi::memory::free_embedding(emb_result1.data, emb_result1.length);
+            }
             unsafe {
                 (*result) = EmbeddingSimilarityResult::default();
             }
@@ -876,6 +880,10 @@ pub extern "C" fn calculate_embedding_similarity(
             if !emb_result1.data.is_null() {
                 crate::ffi::memory::free_embedding(emb_result1.data, emb_result1.length);
             }
+            // Also clean up emb_result2
+            if !emb_result2.data.is_null() {
+                crate::ffi::memory::free_embedding(emb_result2.data, emb_result2.length);
+            }
             unsafe {
                 (*result) = EmbeddingSimilarityResult::default();
             }