doc: Fix comparison operator

Align the documentation with the include/linux/etherdevice.h ,
which is where this example comes from. The return value from
the check was inverted in the documentation.

Signed-off-by: Olaf Mandel <o.mandel@menlosystems.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Cc: Tom Rini <trini@ti.com>
diff --git a/doc/README.unaligned-memory-access.txt b/doc/README.unaligned-memory-access.txt
index 00529f5..70a85f9 100644
--- a/doc/README.unaligned-memory-access.txt
+++ b/doc/README.unaligned-memory-access.txt
@@ -154,7 +154,7 @@
 #else
 	const u16 *a = (const u16 *)addr1;
 	const u16 *b = (const u16 *)addr2;
-	return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) != 0;
+	return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) == 0;
 #endif
 }