strfmon: Fix an edge case when sep_by_space is 2

Fix an edge case by printing the required space when, the currency
symbol succeeds the value, a space separates the sign from the value and
the sign position precedes the quantity and the currency symbol.

In other words:

    n_cs_precedes = 0
    n_sep_by_space = 2
    n_sign_posn = 1

From The Open Group's localeconv[1]:

> When {p,n,int_p,int_n}_sep_by_space is 2:
> If the currency symbol and sign string are adjacent, a space separates
> them; otherwise, a space separates the sign string from the value.

    Format    Before        After
    [%n]      [-123.45¤]    [- 123.45¤]

[1]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/localeconv.html

Obtained from:	Darwin
Reviewed by:	kib
PR:	267282
Github PR:	#619
MFC after:	1 week

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/libc/tests/stdlib/strfmon_test.c b/lib/libc/tests/stdlib/strfmon_test.c
index d4d1f6a580d9..664d1811dc46 100644
--- a/lib/libc/tests/stdlib/strfmon_test.c
+++ b/lib/libc/tests/stdlib/strfmon_test.c
@@ -116,7 +116,7 @@ ATF_TC_BODY(strfmon_cs_precedes_0, tc)
 	    /* sep_by_space x sign_posn */
 	    { "[(123.00$)] [-123.00$] [123.00$-] [123.00-$] [123.00$-]" },
 	    { "[(123.00 $)] [-123.00 $] [123.00 $-] [123.00 -$] [123.00 $-]" },
-	    { "[(123.00$)] [-123.00$] [123.00$ -] [123.00- $] [123.00$ -]" }, /* XXX */
+	    { "[(123.00$)] [- 123.00$] [123.00$ -] [123.00- $] [123.00$ -]" },
 	};
 	size_t i, j;
 	struct lconv *lc;