Fixed typo under 'Segmented stacks and the linter', and removed superfluous trailing whitespace.

Author: mtwilliams

doc/tutorial-ffi.md

@@ -135,7 +135,7 @@ the true length after compression for setting the length.
 ~~~~ {.xfail-test}
 pub fn compress(src: &[u8]) -> ~[u8] {
     #[fixed_stack_segment]; #[inline(never)];
-    
+
     unsafe {
         let srclen = src.len() as size_t;
         let psrc = vec::raw::to_ptr(src);
@@ -157,7 +157,7 @@ format and `snappy_uncompressed_length` will retrieve the exact buffer size requ
 ~~~~ {.xfail-test}
 pub fn uncompress(src: &[u8]) -> Option<~[u8]> {
     #[fixed_stack_segment]; #[inline(never)];
-    
+
     unsafe {
         let srclen = src.len() as size_t;
         let psrc = vec::raw::to_ptr(src);
@@ -236,7 +236,7 @@ use std::libc::size_t;
 unsafe fn snappy_max_compressed_length(source_length: size_t) -> size_t {
     #[fixed_stack_segment]; #[inline(never)];
     return snappy_max_compressed_length(source_length);
-    
+
     #[link_args = "-lsnappy"]
     extern {
         fn snappy_max_compressed_length(source_length: size_t) -> size_t;
@@ -259,9 +259,9 @@ check that one of the following conditions holds:
 2. The call occurs inside of an `extern fn`;
 3. The call occurs within a stack closure created by some other
    safe fn.
-   
+
 All of these conditions ensure that you are running on a large stack
-segmented. However, they are sometimes too strict. If your application
+segment. However, they are sometimes too strict. If your application
 will be making many calls into C, it is often beneficial to promote
 the `#[fixed_stack_segment]` attribute higher up the call chain.  For
 example, the Rust compiler actually labels main itself as requiring a
@@ -298,7 +298,7 @@ impl<T: Send> Unique<T> {
     pub fn new(value: T) -> Unique<T> {
         #[fixed_stack_segment];
         #[inline(never)];
-        
+
         unsafe {
             let ptr = malloc(std::sys::size_of::<T>() as size_t) as *mut T;
             assert!(!ptr::is_null(ptr));
@@ -324,7 +324,7 @@ impl<T: Send> Drop for Unique<T> {
     fn drop(&mut self) {
         #[fixed_stack_segment];
         #[inline(never)];
-        
+
         unsafe {
             let x = intrinsics::init(); // dummy value to swap in
             // moving the object out is needed to call the destructor