dyndbg: no vpr-info on empty queries

when `echo $cmd > control` contains multiple queries, extra query
separators (;\n) can parse as empty statements.  This is normal, and a
vpr-info on an empty command is just noise.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Link: https://lore.kernel.org/r/20211013220726.1280565-4-jim.cromie@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

lib/dynamic_debug.c

@@ -540,8 +540,10 @@ static int ddebug_exec_queries(char *query, const char *modname)
 		}
 		i++;
 	}
-	vpr_info("processed %d queries, with %d matches, %d errs\n",
-		 i, nfound, errs);
+
+	if (i)
+		vpr_info("processed %d queries, with %d matches, %d errs\n",
+			 i, nfound, errs);
 
 	if (exitcode)
 		return exitcode;