fixup! Add context string signature APIs

Signed-off-by: Spencer Wilson <[email protected]>

oqs/src/sig.rs

@@ -4,7 +4,7 @@
 //! for the list of supported algorithms.
 use alloc::vec::Vec;
 
-use core::ptr::{NonNull, null};
+use core::ptr::{null, NonNull};
 
 #[cfg(not(feature = "std"))]
 use cstr_core::CStr;
@@ -428,7 +428,11 @@ impl Sig {
         // For algorithms without context string support, liboqs
         // expects the context to be NULL. Converting an empty
         // slice to a pointer doesn't actually do this.
-        let ctx_str_ptr = if ctx_str.len() != 0 { ctx_str.as_ptr() } else { null() };
+        let ctx_str_ptr = if ctx_str.len() != 0 {
+            ctx_str.as_ptr()
+        } else {
+            null()
+        };
         let status = unsafe {
             func(
                 sig.bytes.as_mut_ptr(),
@@ -496,7 +500,11 @@ impl Sig {
         // For algorithms without context string support, liboqs
         // expects the context to be NULL. Converting an empty
         // slice to a pointer doesn't actually do this.
-        let ctx_str_ptr = if ctx_str.len() != 0 { ctx_str.as_ptr() } else { null() };
+        let ctx_str_ptr = if ctx_str.len() != 0 {
+            ctx_str.as_ptr()
+        } else {
+            null()
+        };
         let status = unsafe {
             func(
                 message.as_ptr(),