[klibc] Fix comment: __getpageshift not __getpagesize

Fix a mistaken reference to __getpagesize() in a comment (there is no such
function.)  It is supposed to be __getpageshift().

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/include/klibc/sysconfig.h b/include/klibc/sysconfig.h
index 48d62a4..1a9cdea 100644
--- a/include/klibc/sysconfig.h
+++ b/include/klibc/sysconfig.h
@@ -58,7 +58,7 @@
  *	On most architectures, this is always 12, but on some
  *	architectures it can be a different number, or the current
  *	page size.  If this is dependent on the page size, define
- *	this to an expression which includes __getpagesize().
+ *	this to an expression which includes __getpageshift().
  */
 #ifndef _KLIBC_MMAP2_SHIFT
 # define _KLIBC_MMAP2_SHIFT 12