Explicit precedence clarifies logic in UseOfLegacyAlgorithm.ql (#36)

Not strictly a bugfix since CodeQL's precedence handles this already (disjunction occurs before conjunction) but the and/or logic for handling "DES" becomes clearer when wrapped in parens.

Author: gsutherland-trailofbits

cpp/src/crypto/UseOfLegacyAlgorithm.ql

@@ -36,9 +36,10 @@ where
      * 			descend
      * 			destroy
      */
-
-    cipherName = "DES" and
-    functionName.regexpMatch(".*(?<!no|mo|co)des(?!cri(be|ption|ptor)|ign|cend|troy).*")
+    (
+      cipherName = "DES" and
+      functionName.regexpMatch(".*(?<!no|mo|co)des(?!cri(be|ption|ptor)|ign|cend|troy).*")
+    )
   )
 select call.getLocation(),
   "Potential use of legacy cryptographic algorithm " + cipherName + " detected in function name " +