Use the correct syscall name in panic message

I copied it from the getrandom code but forgot to change the name.
Reported by Sebastien Marie.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstd/rand/os.rs b/src/libstd/rand/os.rs
index 942e81905d3..a1c1244d397 100644
--- a/src/libstd/rand/os.rs
+++ b/src/libstd/rand/os.rs
@@ -233,7 +233,7 @@ mod imp {
             for s in v.chunks_mut(256) {
                 unsafe { ret = syscall(7, s.as_mut_ptr(), s.len()); }
                 if ret == -1 {
-                    panic!("unexpected getrandom error: {}", errno());
+                    panic!("unexpected getentropy error: {}", errno());
                 }
             }
         }