Update src/cargo/util/network/http.rs

Co-authored-by: Weihang Lo <weihanglo@users.noreply.github.com>

Author: koxu1996

src/cargo/util/network/http.rs

@@ -62,12 +62,7 @@ pub fn configure_http_handle(gctx: &GlobalContext, handle: &mut Easy) -> CargoRe
         handle.cainfo(&cainfo)?;
     }
     // Use `proxy_cainfo` if explicitly set; otherwise, fall back to `cainfo` as curl does #15376.
-    let effective_proxy_cainfo = match (&http.proxy_cainfo, &http.cainfo) {
-        (Some(p), _) => Some(p),
-        (None, Some(ca)) => Some(ca),
-        _ => None,
-    };
-    if let Some(proxy_cainfo) = effective_proxy_cainfo {
+    if let Some(proxy_cainfo) = http.proxy_cainfo.as_ref().or(http.cainfo.as_ref()) {
         let proxy_cainfo = proxy_cainfo.resolve_path(gctx);
         handle.proxy_cainfo(&format!("{}", proxy_cainfo.display()))?;
     }