Auto merge of #581 - michaelwright235:cfixes, r=jdm

Fix compilation warnings

We get a couple of warnings during compilation, so I've fixed them.

cocoa-foundation/src/foundation.rs

@@ -611,7 +611,7 @@ pub trait NSString: Sized {
     unsafe fn init_str(self, string: &str) -> Self;
     unsafe fn UTF8String(self) -> *const libc::c_char;
     unsafe fn len(self) -> usize;
-    unsafe fn isEqualToString(self, &str) -> bool;
+    unsafe fn isEqualToString(self, string: &str) -> bool;
     unsafe fn substringWithRange(self, range: NSRange) -> id;
 }
 

cocoa/examples/nsvisualeffectview_blur.rs

@@ -2,11 +2,11 @@ extern crate cocoa;
 extern crate objc;
 
 use objc::*;
-use cocoa::base::{selector, id, nil, NO};
+use cocoa::base::{selector, nil, NO};
 
 use cocoa::foundation::{NSRect, NSPoint, NSSize, NSAutoreleasePool, NSProcessInfo,
                         NSString};
-use cocoa::appkit::{NSApp, NSColor, NSColorSpace, NSApplication, NSApplicationActivationPolicyRegular, NSMenu, NSMenuItem, NSWindowStyleMask, NSBackingStoreType, NSWindow, NSRunningApplication, NSApplicationActivateIgnoringOtherApps, NSView, NSVisualEffectMaterial, NSVisualEffectView, NSViewWidthSizable, NSViewHeightSizable, NSVisualEffectBlendingMode, NSVisualEffectState, NSWindowOrderingMode};
+use cocoa::appkit::{NSApp, NSColor, NSApplication, NSApplicationActivationPolicyRegular, NSMenu, NSMenuItem, NSWindowStyleMask, NSBackingStoreType, NSWindow, NSView, NSVisualEffectMaterial, NSVisualEffectView, NSViewWidthSizable, NSViewHeightSizable, NSVisualEffectBlendingMode, NSVisualEffectState, NSWindowOrderingMode};
 
 
 fn main() {

core-graphics-types/src/base.rs

@@ -26,7 +26,7 @@ pub type CGFloat = libc::c_double;
 #[cfg(not(target_pointer_width = "64"))]
 pub type CGFloat = libc::c_float;
 
-pub type CGError = libc::int32_t;
+pub type CGError = i32;
 
 pub type CGGlyph = libc::c_ushort;
 

core-graphics/src/event.rs

@@ -505,7 +505,7 @@ impl<'tap_life> CGEventTap<'tap_life> {
                     callback_ref: Box::from_raw(cbr),
                 })
             } else {
-                Box::from_raw(cbr);
+                let _ = Box::from_raw(cbr);
                 Err(())
             }
         }