arch_align_stack() moved to asm/exec.h, so change the comment referring to
asm/system.h which no longer exists.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jeff Dike <redacted>
cc: Richard Weinberger <richard@nod.at>
cc: user-mode-linux-devel@lists.sourceforge.net
---

 arch/um/kernel/process.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index eecc414..f17bca8 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c

@@ -359,7 +359,7 @@ int singlestepping(void * t)
 /*
  * Only x86 and x86_64 have an arch_align_stack().
  * All other arches have "#define arch_align_stack(x) (x)"
- * in their asm/system.h
+ * in their asm/exec.h
  * As this is included in UML from asm-um/system-generic.h,
  * we can use it to behave as the subarch does.
  */