compiler: fixup Sprintf uses

Author: dgryski

compiler/symbol.go

@@ -353,7 +353,7 @@ func (c *compilerContext) checkWasmImport(f *ssa.Function, pragma string) {
 	}
 	if f.Blocks != nil {
 		// Defined functions cannot be exported.
-		c.addError(f.Pos(), fmt.Sprintf("can only use //go:wasmimport on declarations"))
+		c.addError(f.Pos(), "can only use //go:wasmimport on declarations")
 		return
 	}
 	if f.Signature.Results().Len() > 1 {

main.go

@@ -958,7 +958,7 @@ func buildAndRun(pkgName string, config *compileopts.Config, stdout io.Writer, c
 	err = run(cmd, result)
 	if err != nil {
 		if ctx != nil && ctx.Err() == context.DeadlineExceeded {
-			stdout.Write([]byte(fmt.Sprintf("--- timeout of %s exceeded, terminating...\n", timeout)))
+			fmt.Fprintf(stdout, "--- timeout of %s exceeded, terminating...\n", timeout)
 			err = ctx.Err()
 		}
 		return result, &commandError{"failed to run compiled binary", result.Binary, err}