zcache - trivial tweak to build-time error message wording

[Valdis . Kletnieks]

Clarify that the requirement is "at least one of" - the error message could
potentially be read as both being required.

Yes, the line is over 80 chars.  You can't get 79 chars of text and a #error
into 80 chars :)

Patch against linux-next-20110831

Signed-off-by: Valdis Kletnieks <valdis.kletnieks@xxxxxx>

--- linux-next/drivers/staging/zcache/zcache-main.c.dist	2011-08-31 13:31:27.054696837 -0400
+++ linux-next/drivers/staging/zcache/zcache-main.c	2011-08-31 16:16:46.055659964 -0400
@@ -34,7 +34,7 @@
 #include "../zram/xvmalloc.h" /* if built in drivers/staging */
 
 #if (!defined(CONFIG_CLEANCACHE) && !defined(CONFIG_FRONTSWAP))
-#error "zcache is useless without CONFIG_CLEANCACHE or CONFIG_FRONTSWAP"
+#error "zcache is useless without at least one of CONFIG_CLEANCACHE or CONFIG_FRONTSWAP"
 #endif
 #ifdef CONFIG_CLEANCACHE
 #include <linux/cleancache.h>

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