uml: rename os_{read_write}_file_k back to os_{read_write}_file

Rename os_{read_write}_file_k back to os_{read_write}_file, delete
the originals and their bogus infrastructure, and fix all the callers.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/um/kernel/initrd.c b/arch/um/kernel/initrd.c
index cff73fa..16dc43e 100644
--- a/arch/um/kernel/initrd.c
+++ b/arch/um/kernel/initrd.c
@@ -63,7 +63,7 @@
 		printk("Opening '%s' failed - err = %d\n", filename, -fd);
 		return -1;
 	}
-	n = os_read_file_k(fd, buf, size);
+	n = os_read_file(fd, buf, size);
 	if(n != size){
 		printk("Read of %d bytes from '%s' failed, err = %d\n", size,
 		       filename, -n);