prefer `if (s)' to `if (nil != s)' for objective-c

in objc, explicit comparison with nil isn't necessary and can produce errors like:
  comparison between distinct pointer types (...) and 'objc_object*' lacks a cast

upd: thanks Norbert Thiebaud for suggestion
  ``hitChild is a Reference so hitChild = nil was !hitChild.is() right?''

Change-Id: I105be50e5a37bb63e360622e590ec4916fa8a84f
Reviewed-on: https://gerrit.libreoffice.org/11891
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/vcl/osx/a11ywrappercheckbox.mm b/vcl/osx/a11ywrappercheckbox.mm
index e8ea2a00b9d6..e8e6ad3d0210 100644
--- a/vcl/osx/a11ywrappercheckbox.mm
+++ b/vcl/osx/a11ywrappercheckbox.mm
@@ -29,7 +29,7 @@
 @implementation AquaA11yWrapperCheckBox : AquaA11yWrapper
 
 -(id)valueAttribute {
-    if ( [ self accessibleValue ] != nil ) {
+    if ( [ self accessibleValue ] ) {
         return [ AquaA11yValueWrapper valueAttributeForElement: self ];
     }
     return [ NSNumber numberWithInt: 0 ];