Fixes used build warnings

Fixes redundant () warnings by rust-analyzer

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
5 jobs for warnings in 1 minute and 44 seconds (queued for 2 minutes and 7 seconds)
latest
Status Name Job ID Coverage
  Build
failed build:linux #30124

00:00:45

failed build:redox #30125

00:00:23

 
  Test
passed fmt #30128

00:00:35

skipped test:linux #30126
skipped test:redox #30127
allowed to fail
 
Name Stage Failure
failed
build:redox Build

Caused by:
No such file or directory (os error 2)
make: *** [Makefile:171: "target/x86_64-unknown-redox"/release/crt0.o] Error 101
mv "target/x86_64-unknown-redox"/pthreads-emb.partial "target/x86_64-unknown-redox"/pthreads-emb
touch "target/x86_64-unknown-redox"/pthreads-emb
mv "target/x86_64-unknown-redox"/openlibm.partial "target/x86_64-unknown-redox"/openlibm
touch "target/x86_64-unknown-redox"/openlibm
ERROR: Job failed: exit code 1
failed
build:linux Build
  Unable to update /builds/lygstate/relibc/core_io

Caused by:
failed to read `/builds/lygstate/relibc/core_io/Cargo.toml`

Caused by:
No such file or directory (os error 2)
make: *** [Makefile:171: target/release/crt0.o] Error 101
ERROR: Job failed: exit code 1