fix iconv conversion to legacy 8bit codepages

this seems to have been a simple copy-and-paste error from the code
for converting from legacy codepages.

src/locale/iconv.c

@@ -316,8 +316,8 @@ size_t iconv(iconv_t cd0, char **restrict in, size_t *restrict inb, char **restr
 			}
 			d = c;
 			for (c=0; c<128-totype; c++) {
-				if (d == legacy_chars[ map[c*5/4]>>2*c%8 |
-					map[c*5/4+1]<<8-2*c%8 & 1023 ]) {
+				if (d == legacy_chars[ tomap[c*5/4]>>2*c%8 |
+					tomap[c*5/4+1]<<8-2*c%8 & 1023 ]) {
 					c += 128;
 					goto revout;
 				}