Slightly simplify

zng/cmake.rs

@@ -18,8 +18,7 @@ pub fn build_zlib_ng(target: &str, compat: bool) {
         // Check if we should pass on an explicit boolean value of the WITH_RVV build option.
         // See: https://github.com/zlib-ng/zlib-ng?tab=readme-ov-file#advanced-build-options
         if let Ok(value) = env::var("RISCV_WITH_RVV") {
-            let value = value.trim().to_uppercase();
-            match value.as_str() {
+            match value.trim().to_uppercase().as_str() {
                 "OFF" | "NO" | "FALSE" | "0" => {
                     // Force RVV off. This turns off RVV entirely, as well as the runtime check for it.
                     // This is not usually necessary, but can be useful for building binaries portable