patch 8.2.4750: small pieces of dead code

Problem:    Small pieces of dead code.
Solution:   Remove the dead code. (Goc Dundar, closes #10190) Rename the
            qftf_cb struct member to avoid confusion.
diff --git a/src/ex_cmds.c b/src/ex_cmds.c
index 50829be..9ea2fd6 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -4960,8 +4960,7 @@
     else
     {
 	delim = *cmd;		// get the delimiter
-	if (delim)
-	    ++cmd;		// skip delimiter if there is one
+	++cmd;			// skip delimiter if there is one
 	pat = cmd;		// remember start of pattern
 	cmd = skip_regexp_ex(cmd, delim, magic_isset(), &eap->arg, NULL, NULL);
 	if (cmd[0] == delim)		    // end delimiter found