git-format-patch: fix bug using -o in subdirectories

diff --git a/mktag.c b/mktag.c
index 09b6e437d46a71b0123b5cb791cc537cf946e7a1..3448a5dde7cbd795b08db872180f03dcfb66b99a 100644 (file)
--- a/mktag.c
+++ b/mktag.c
@@ -119,11 +119,11 @@ static int verify_tag(char *buffer, unsigned long size)
 int main(int argc, char **argv)
 {
        unsigned long size = 4096;
-       char *buffer = malloc(size);
+       char *buffer = xmalloc(size);
        unsigned char result_sha1[20];
 
        if (argc != 1)
-               usage("cat <signaturefile> | git-mktag");
+               usage("git-mktag < signaturefile");
 
        setup_git_directory();