mm: nommu: fix a compile warning in do_mmap_pgoff()

Because 'ret' is declared as int, not unsigned long, no need to cast the
error contants into unsigned long.  If you compile this code on a 64-bit
machine somehow, you'll see following warning:

    CC      mm/nommu.o
  mm/nommu.c: In function `do_mmap_pgoff':
  mm/nommu.c:1411: warning: overflow in implicit constant conversion

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/mm/nommu.c b/mm/nommu.c
index 57ae6126b29a..92e1a47d1e52 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1376,15 +1376,15 @@ unsigned long do_mmap_pgoff(struct file *file,
                 if (capabilities & BDI_CAP_MAP_DIRECT) {
                         addr = file->f_op->get_unmapped_area(file, addr, len,
                                                              pgoff, flags);
-                        if (IS_ERR((void *) addr)) {
+                        if (IS_ERR_VALUE(addr)) {
                                 ret = addr;
-                                if (ret != (unsigned long) -ENOSYS)
+                                if (ret != -ENOSYS)
                                         goto error_just_free;
 
                                 /* the driver refused to tell us where to site
                                  * the mapping so we'll have to attempt to copy
                                  * it */
-                                ret = (unsigned long) -ENODEV;
+                                ret = -ENODEV;
                                 if (!(capabilities & BDI_CAP_MAP_COPY))
                                         goto error_just_free;