Fix error messages.

llvm-svn: 320772
diff --git a/lld/wasm/InputFiles.cpp b/lld/wasm/InputFiles.cpp
index 3dc5fa8..9931495 100644
--- a/lld/wasm/InputFiles.cpp
+++ b/lld/wasm/InputFiles.cpp
@@ -135,7 +135,7 @@
       return Segment;
     }
   }
-  error("Symbol not found in any segment: " + WasmSym.Name);
+  error("symbol not found in any segment: " + WasmSym.Name);
   return nullptr;
 }