Remove duplicate assignment.

Reviewed-by: NTim Hudson <tjh@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4565)

crypto/asn1/asn_mime.c

@@ -949,7 +949,7 @@ static int strip_eol(char *linebuf, int *plen, int flags)
     int len = *plen;
     char *p, c;
     int is_eol = 0;
-    p = linebuf + len - 1;
+
     for (p = linebuf + len - 1; len > 0; len--, p--) {
         c = *p;
         if (c == '\n')