libc: switch `free` to the proper signature

This does not attempt to fully propagate the mutability everywhere, but
gives new code a hint to avoid the same issues.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstd/libc.rs b/src/libstd/libc.rs
index 77ac226a7f1..a2aa182216a 100644
--- a/src/libstd/libc.rs
+++ b/src/libstd/libc.rs
@@ -3225,7 +3225,7 @@ pub mod funcs {
                 pub fn calloc(nobj: size_t, size: size_t) -> *c_void;
                 pub fn malloc(size: size_t) -> *mut c_void;
                 pub fn realloc(p: *mut c_void, size: size_t) -> *mut c_void;
-                pub fn free(p: *c_void);
+                pub fn free(p: *mut c_void);
                 pub fn exit(status: c_int) -> !;
                 // Omitted: atexit.
                 pub fn system(s: *c_char) -> c_int;