Remove side-effect from assertion; add release build to travis

.travis.yml

@@ -15,7 +15,9 @@ install:
 script:
   - |
       travis-cargo build &&
+      travis-cargo build --release &&
       travis-cargo test &&
+      travis-cargo test --release &&
       travis-cargo bench &&
       travis-cargo --only stable doc
 

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 
 name = "secp256k1"
-version = "0.5.0"
+version = "0.5.1"
 authors = [ "Dawid Ciężarkiewicz <dpc@ucore.info>",
             "Andrew Poelstra <apoelstra@wpsoftware.net>" ]
 license = "CC0-1.0"

src/key.rs

@@ -161,9 +161,10 @@ impl PublicKey {
         unsafe {
             let mut ret_len = ret.len() as ::libc::size_t;
             let compressed = if compressed { ffi::SECP256K1_SER_COMPRESSED } else { ffi::SECP256K1_SER_UNCOMPRESSED };
-            debug_assert!(ffi::secp256k1_ec_pubkey_serialize(secp.ctx, ret.as_ptr(),
+            let err = ffi::secp256k1_ec_pubkey_serialize(secp.ctx, ret.as_ptr(),
                                                          &mut ret_len, self.as_ptr(),
-                                                             compressed) == 1);
+                                                         compressed);
+            debug_assert_eq!(err, 1);
             ret.set_len(ret_len as usize);
         }
         ret