Fix GCC 7 string truncation warning, too small temporary buffer

In GCC 7 the -Wall infers the new -Wformat-truncation which finds
problems with string truncation in functions like snprintf().

This patch fixes a possibly problem in path name creation which,
combined with the scandir() function, might cause loss of .conf
files, failure to call run-parts properly, and kill services at
shutdown.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/sig.c

@@ -116,7 +116,7 @@ void do_kill(int signo)
 		while ((d = readdir(dirp))) {
 			int pid;
 			FILE *fp;
-			char file[80] = "";
+			char file[LINE_SIZE] = "";
 
 			if (d->d_type != DT_DIR)
 				continue;