redundant lifetime parameter removed

src/rocksdb.rs

@@ -577,7 +577,7 @@ pub struct MergeOperands<'a> {
 }
 
 impl <'a> MergeOperands<'a> {
-    fn new<'a>(operands_list: *const *const c_char,
+    fn new(operands_list: *const *const c_char,
            operands_list_len: *const size_t,
            num_operands: c_int) -> MergeOperands<'a> {
         assert!(num_operands >= 0);