[asmjs] Avoid truncation of error messages

src/asmjs/asm-typer.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/asmjs/asm-typer.h"
 
 #include <algorithm>
 #include <limits>
 #include <memory>
 #include <string>
 
 #include "src/v8.h"
 
 #include "src/asmjs/asm-types.h"
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/base/bits.h"
 #include "src/codegen.h"
 #include "src/globals.h"
 #include "src/utils.h"
 
 #define FAIL(node, msg)                                        \
   do {                                                         \
     int line = node->position() == kNoSourcePosition           \
                    ? -1                                        \
                    : script_->GetLineNumber(node->position()); \
     base::OS::SNPrintF(error_message_, sizeof(error_message_), \
-                       "asm: line %d: %s\n", line + 1, msg);   \
+                       "asm: line %d: %s", line + 1, msg);     \
     return AsmType::None();                                    \
   } while (false)
 
 #define RECURSE(call)                                             \
   do {                                                            \
     if (GetCurrentStackPosition() < stack_limit_) {               \
       stack_overflow_ = true;                                     \
       FAIL(root_, "Stack overflow while parsing asm.js module."); \
     }                                                             \
                                                                   \
@@ skipping 2818 matching lines @@
     return true;
   }
 
   *error_message = typer.error_message();
   return false;
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8