Don't cast away const qualifiers.

Spotted by:	bde

lib/libc/locale/big5.c

@@ -78,7 +78,7 @@ int
 _BIG5_mbsinit(const mbstate_t *ps)
 {
 
-	return (ps == NULL || ((_BIG5State *)ps)->count == 0);
+	return (ps == NULL || ((const _BIG5State *)ps)->count == 0);
 }
 
 static __inline int

lib/libc/locale/euc.c

@@ -126,7 +126,7 @@ int
 _EUC_mbsinit(const mbstate_t *ps)
 {
 
-	return (ps == NULL || ((_EucState *)ps)->count == 0);
+	return (ps == NULL || ((const _EucState *)ps)->count == 0);
 }
 
 #define	CEI	((_EucInfo *)(_CurrentRuneLocale->variable))

lib/libc/locale/gb18030.c

@@ -71,7 +71,7 @@ int
 _GB18030_mbsinit(const mbstate_t *ps)
 {
 
-	return (ps == NULL || ((_GB18030State *)ps)->count == 0);
+	return (ps == NULL || ((const _GB18030State *)ps)->count == 0);
 }
 
 size_t

lib/libc/locale/gb2312.c

@@ -65,7 +65,7 @@ int
 _GB2312_mbsinit(const mbstate_t *ps)
 {
 
-	return (ps == NULL || ((_GB2312State *)ps)->count == 0);
+	return (ps == NULL || ((const _GB2312State *)ps)->count == 0);
 }
 
 static __inline int

lib/libc/locale/gbk.c

@@ -75,7 +75,7 @@ int
 _GBK_mbsinit(const mbstate_t *ps)
 {
 
-	return (ps == NULL || ((_GBKState *)ps)->count == 0);
+	return (ps == NULL || ((const _GBKState *)ps)->count == 0);
 }
 
 static __inline int

lib/libc/locale/mskanji.c

@@ -76,7 +76,7 @@ int
 _MSKanji_mbsinit(const mbstate_t *ps)
 {
 
-	return (ps == NULL || ((_MSKanjiState *)ps)->count == 0);
+	return (ps == NULL || ((const _MSKanjiState *)ps)->count == 0);
 }
 
 size_t

lib/libc/locale/utf2.c

@@ -77,7 +77,7 @@ int
 _UTF2_mbsinit(const mbstate_t *ps)
 {
 
-	return (ps == NULL || ((_UTF2State *)ps)->count == 0);
+	return (ps == NULL || ((const _UTF2State *)ps)->count == 0);
 }
 
 size_t

lib/libc/locale/utf8.c

@@ -65,7 +65,7 @@ int
 _UTF8_mbsinit(const mbstate_t *ps)
 {
 
-	return (ps == NULL || ((_UTF8State *)ps)->count == 0);
+	return (ps == NULL || ((const _UTF8State *)ps)->count == 0);
 }
 
 size_t