Stop open-coding read_to_string

Author: workingjubilee

src/symbolize/gimli/parse_running_mmaps_unix.rs

@@ -2,7 +2,7 @@
 // in `mod libs_dl_iterate_phdr` (e.g. linux, freebsd, ...); it may be more
 // general purpose, but it hasn't been tested elsewhere.
 
-use super::mystd::fs::File;
+use super::mystd::fs::{self, File};
 use super::mystd::io::Read;
 use super::mystd::str::FromStr;
 use super::{OsString, String, Vec};
@@ -54,18 +54,9 @@ pub(super) struct MapsEntry {
 }
 
 pub(super) fn parse_maps() -> Result<Vec<MapsEntry>, &'static str> {
-    let mut v = Vec::new();
-    let mut proc_self_maps =
-        File::open("/proc/self/maps").map_err(|_| "Couldn't open /proc/self/maps")?;
-    let mut buf = String::new();
-    let _bytes_read = proc_self_maps
-        .read_to_string(&mut buf)
-        .map_err(|_| "Couldn't read /proc/self/maps")?;
-    for line in buf.lines() {
-        v.push(line.parse()?);
-    }
+    let buf = fs::read_to_string("/proc/self/maps").map_err(|_| "")?;
 
-    Ok(v)
+    buf.lines().map(|line| line.parse()).collect()
 }
 
 impl MapsEntry {