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Error out if getcwd fails.

--- a/6/gengas.c

+++ b/6/gengas.c

@@ -9,6 +9,7 @@

 #include <sys/stat.h>

 #include <fcntl.h>

 #include <unistd.h>

+#include <errno.h>

 #include "util.h"

 #include "parse.h"

@@ -471,7 +472,8 @@

 	}

 	popstab();

-	getcwd(dir, sizeof dir);

+	if (!getcwd(dir, sizeof dir))

+		die("could not get cwd: %s\n", strerror(errno));

 	for (i = 0; i < file->file.nfiles; i++) {

 		path = file->file.files[i];

 		fprintf(fd, ".file %zd \"%s/%s\"\n", i + 1, dir, path);