Remove useless code

RT#4081

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

apps/engine.c

@@ -94,17 +94,12 @@ static void identity(char *ptr)
 
 static int append_buf(char **buf, const char *s, int *size, int step)
 {
-    int l = strlen(s);
-
     if (*buf == NULL) {
         *size = step;
         *buf = app_malloc(*size, "engine buffer");
         **buf = '\0';
     }
 
-    if (**buf != '\0')
-        l += 2;                 /* ", " */
-
     if (strlen(*buf) + strlen(s) >= (unsigned int)*size) {
         *size += step;
         *buf = OPENSSL_realloc(*buf, *size);