Make wget more Zig-ish

Author: rodolpheh

src/zemscripten.zig

@@ -202,8 +202,10 @@ pub fn log(
 extern fn emscripten_wget(url: [*c]const u8, file: [*c]const u8) c_int;
 extern fn emscripten_wget_data(url: [*c]const u8, pbuffer: **anyopaque, pnum: *c_int, perror: *c_int) void;
 
-pub fn wget(url: [:0]const u8, file: [:0]const u8) c_int {
-    return emscripten_wget(url.ptr, file.ptr);
+pub fn wget(url: [:0]const u8, file: [:0]const u8) !void {
+    if (emscripten_wget(url.ptr, file.ptr) != 0) {
+        return error.WgetError;
+    }
 }
 
 pub fn wget_data(url: [:0]const u8) ![]u8 {