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git/log: allow running from a subdirectory

This used to work in the rc implementation and there is some code to
calculate relative paths from the repository root, but it did not
change working directory so refs couldn't be resolved.

--- a/log.c

+++ b/log.c

@@ -295,9 +295,9 @@

 		break;

 	}ARGEND;

+	if(findrepo(repo, sizeof(repo)) == -1)

+		sysfatal("find root: %r");

 	if(argc != 0){

-		if(findrepo(repo, sizeof(repo)) == -1)

-			sysfatal("find root: %r");

 		if(getwd(path, sizeof(path)) == nil)

 			sysfatal("getwd: %r");

 		if(strlen(path) < strlen(repo))

@@ -311,6 +311,8 @@

 			free(r);

 		}

 	}

+	if(chdir(repo) == -1)

+		sysfatal("chdir: %r");

 	gitinit();

 	tmfmtinstall();