pnpacpi: fix incorrect TEST_ALPHA() test

TEST_ALPHA() is broken and always returns 0.

[akpm@linux-foundation.org: return false for '@' as well, per Bjorn]
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/pnp/pnpacpi/core.c

@@ -58,7 +58,7 @@ static inline int __init is_exclusive_device(struct acpi_device *dev)
 	if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
 		return 0
 #define TEST_ALPHA(c) \
-	if (!('@' <= (c) || (c) <= 'Z')) \
+	if (!('A' <= (c) && (c) <= 'Z')) \
 		return 0
 static int __init ispnpidacpi(const char *id)
 {