strfmon: Fix formatting of a second fixed-width value

There is a bug when formatting two consecutive values using fixed-widths
and the values need padding.  This was because the value of pad_size
was zeroed only every other time.

Format           Before                         After
[%8n] [%8n]      [ $123.45] [       $123.45]    [ $123.45] [ $123.45]

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

lib/libc/stdlib/strfmon.c

@@ -135,7 +135,6 @@ vstrfmon_l(char * __restrict s, size_t maxsize, locale_t loc,
 	fmt = format;
 	asciivalue = NULL;
 	currency_symbol = NULL;
-	pad_size = 0;
 
 	while (*fmt) {
 		/* pass nonformating characters AS IS */
@@ -155,6 +154,7 @@ vstrfmon_l(char * __restrict s, size_t maxsize, locale_t loc,
 		/* set up initial values */
 		flags = (NEED_GROUPING|LOCALE_POSN);
 		pad_char = ' ';		/* padding character is "space" */
+		pad_size = 0;		/* no padding initially */
 		left_prec = -1;		/* no left precision specified */
 		right_prec = -1;	/* no right precision specified */
 		width = -1;		/* no width specified */

lib/libc/tests/stdlib/strfmon_test.c

@@ -74,7 +74,7 @@ ATF_TC_BODY(strfmon_examples, tc)
 		const char *expected;
 	} tests[] = {
 	    { "%n", "[$123.45] [-$123.45] [$3,456.78]" },
-	    { "%11n", "[    $123.45] [       -$123.45] [  $3,456.78]" }, /* XXX */
+	    { "%11n", "[    $123.45] [   -$123.45] [  $3,456.78]" },
 	    { "%#5n", "[ $   123.45] [-$   123.45] [ $ 3,456.78]" },
 	    { "%=*#5n", "[ $***123.45] [-$***123.45] [ $*3,456.78]" },
 	    { "%=0#5n", "[ $000123.45] [-$000123.45] [ $03,456.78]" },