Eliminate redundant uses of format!.

https://github.com/rust-lang-nursery/rust-clippy/wiki#useless_format

lib/wasm/src/module_translator.rs

@@ -254,7 +254,7 @@ pub fn translate_module(
                     .collect()
             }
             ParserState::EndSection => break,
-            _ => return Err(String::from(format!("wrong content in code section"))),
+            _ => return Err(String::from("wrong content in code section")),
         };
         let signature = signatures[functions[function_index as usize] as usize].clone();
         match translate_function_body(

lib/wasm/src/sections_translator.rs

@@ -283,7 +283,7 @@ pub fn parse_data_section(
             };
             match runtime.declare_data_initialization(memory_index as MemoryIndex, offset, data) {
                 Ok(()) => (),
-                Err(s) => return Err(SectionParsingError::WrongSectionContent(format!("{}", s))),
+                Err(s) => return Err(SectionParsingError::WrongSectionContent(s)),
             };
         }
         match *parser.read() {