xargs(1): remove unused variable

[Julien Ramseier]

The repllen variable is not used anywhere.

Index: strnsubst.c
===================================================================
RCS file: /cvs/src/usr.bin/xargs/strnsubst.c,v
retrieving revision 1.5
diff -u -r1.5 strnsubst.c
--- strnsubst.c 27 Oct 2009 23:59:50 -0000      1.5
+++ strnsubst.c 3 Jan 2017 10:26:22 -0000
@@ -31,7 +31,7 @@
 strnsubst(char **str, const char *match, const char *replstr, size_t maxsize)
 {
        char *s1, *s2, *this;
-       size_t matchlen, repllen, s2len;
+       size_t matchlen, s2len;
        int n;

        if ((s1 = *str) == NULL)
@@ -50,7 +50,6 @@
        *s2 = '\0';
        s2len = 0;
        matchlen = strlen(match);
-       repllen = strlen(replstr);
        for (;;) {
                if ((this = strstr(s1, match)) == NULL)
                        break;