ARM: 8476/1: VDSO: use PTR_ERR_OR_ZERO for vma check

Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR
Signed-off-by: Prasanna Karthik <mkarthi3@visteon.com>
Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/kernel/vdso.c

@@ -224,7 +224,7 @@ static int install_vvar(struct mm_struct *mm, unsigned long addr)
 				       VM_READ | VM_MAYREAD,
 				       &vdso_data_mapping);
 
-	return IS_ERR(vma) ? PTR_ERR(vma) : 0;
+	return PTR_ERR_OR_ZERO(vma);
 }
 
 /* assumes mmap_sem is write-locked */