trivial: Fix dubious bitwise 'or' usage spotted by sparse.

It doesn't change the semantics, but it looks like
the logical 'or' was meant to be used here.
Signed-off-by: Alexey Zaytsev <alexey.zaytsev@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/isdn/mISDN/l1oip_codec.c

@@ -331,7 +331,7 @@ l1oip_4bit_alloc(int ulaw)
 	/* alloc conversion tables */
 	table_com = vmalloc(65536);
 	table_dec = vmalloc(512);
-	if (!table_com | !table_dec) {
+	if (!table_com || !table_dec) {
 		l1oip_4bit_free();
 		return -ENOMEM;
 	}