SKAS x86-64: fixlet for proc/mm64 support

Use proc_mm_get_mm64 instead of proc_mm_get_mm, since the latter will
(correctly) refuse file descriptors for /proc/mm64.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Index: linux-2.6.14/arch/x86_64/kernel/ptrace.c
===================================================================
--- linux-2.6.14.orig/arch/x86_64/kernel/ptrace.c	2005-10-29 05:50:31.000000000 +0200
+++ linux-2.6.14/arch/x86_64/kernel/ptrace.c	2005-10-29 05:50:32.000000000 +0200
@@ -642,7 +642,7 @@
 
 	case PTRACE_SWITCH_MM: {
 		struct mm_struct *old = child->mm;
-		struct mm_struct *new = proc_mm_get_mm(data);
+		struct mm_struct *new = proc_mm_get_mm64(data);
 
 		if(IS_ERR(new)){
 			ret = PTR_ERR(new);