[tip:x86/vdso] mm: Clean up style in install_special_mapping()

["tip-bot for H. Peter Anvin" <tipbot@zytor.com>]

Commit-ID:  3af7111e2066a641510c16a4e9e82dd81550115b
Gitweb:     http://git.kernel.org/tip/3af7111e2066a641510c16a4e9e82dd81550115b
Author:     H. Peter Anvin <hpa@linux.intel.com>
AuthorDate: Wed, 19 Feb 2014 20:46:57 -0800
Committer:  H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Wed, 19 Feb 2014 20:46:57 -0800

mm: Clean up style in install_special_mapping()

We can clean up the style in install_special_mapping(), and make it
use PTR_ERR_OR_ZERO().

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Link: http://lkml.kernel.org/r/1392587568-7325-3-git-send-email-stefani@seibold.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
 mm/mmap.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 81ba54f..6b78a77 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2959,12 +2959,10 @@ int install_special_mapping(struct mm_struct *mm,
 			    unsigned long addr, unsigned long len,
 			    unsigned long vm_flags, struct page **pages)
 {
-	struct vm_area_struct *vma = _install_special_mapping(mm,
-			    addr, len, vm_flags, pages);
+	struct vm_area_struct *vma;
 
-	if (IS_ERR(vma))
-		return PTR_ERR(vma);
-	return 0;
+	vma = _install_special_mapping(mm, addr, len, vm_flags, pages);
+	return PTR_ERR_OR_ZERO(vma);
 }
 
 static DEFINE_MUTEX(mm_all_locks_mutex);