Make chdir failures visible

Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git.c

@@ -195,8 +195,8 @@ static int handle_alias(int *argcp, const char ***argv)
 		ret = 1;
 	}
 
-	if (subdir)
+	if (subdir && chdir(subdir))
-		chdir(subdir);
+		die("Cannot change to %s: %s", subdir, strerror(errno));
 
 	errno = saved_errno;
 

setup.c

@@ -470,7 +470,8 @@ const char *setup_git_directory_gently(int *nongit_ok)
 			}
 			die("Not a git repository");
 		}
-		chdir("..");
+		if (chdir(".."))
+			die("Cannot change to %s/..: %s", cwd, strerror(errno));
 	}
 
 	inside_git_dir = 0;