[PATCH 2/2] gettext.h: add parentheses around N_ expansion

["Kyle J. McKay" <mackyle@gmail.com>]

The N_ macro is used to mark strings for translation without
actually translating them.  At runtime the string is expected
to be passed to the gettext API for translation.

If two N_ macro invocations appear next to each other with only
whitespace (or nothing at all) between them, the two separate
strings will be marked for translation, but the preprocessor
will then combine the strings into one and at runtime the
string passed to gettext will not match the strings that were
translated.

Avoid this by adding parentheses around the expansion of the
N_ macro so that instead of ending up with two adjacent strings
that are then combined by the preprocessor, two adjacent strings
surrounded by parentheses result instead which causes a compile
error so the mistake can be quickly found and corrected.

Signed-off-by: Kyle J. McKay <mackyle@gmail.com>
---
This patch is optional, but prevents the problem fixed by 1/2
from recurring.

 gettext.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gettext.h b/gettext.h
index 7671d09d..d11a4139 100644
--- a/gettext.h
+++ b/gettext.h
@@ -63,6 +63,6 @@ const char *Q_(const char *msgid, const char *plu, unsigned long n)
 }
 
 /* Mark msgid for translation but do not translate it. */
-#define N_(msgid) msgid
+#define N_(msgid) (msgid)
 
 #endif
-- 
2.1.4