Fix scan symbol name issue in kvs40xx.c

Introduced in last commit to that file.

ChangeLog

@@ -1,3 +1,7 @@
+2012-08-17 Chris Bagwell <chris at cnpbagwell dot com>
+	* backend/kvs40xx.c: Fix scan() symbol name that
+	was still conflicting the epjistu and snapscan backends.
+
 2012-08-16 Rolf Bensch <rolf at bensch hyphen online dot de>
 	* backend/pixma.[ch], backend/pixma_common.[ch], 
 	backend/pixma_imageclass.c, backend/pixma_mp*.c:

backend/kvs40xx.c

@@ -592,7 +592,7 @@ sane_start (SANE_Handle handle)
 	    return st;
 	}
 
-      st = scan (s);
+      st = ksv40xx_scan (s);
       if (st)
 	return st;