Merge branch 'nd/help-align-command-desc'

Output from "git help" was not correctly aligned, which has been
fixed.

* nd/help-align-command-desc:
  help: align the longest command in the command listing
diff --git a/help.c b/help.c
index ff05fd2..520c908 100644
--- a/help.c
+++ b/help.c
@@ -85,7 +85,8 @@
 		if (cmds[i].category & mask) {
 			size_t len = strlen(cmds[i].name);
 			printf("   %s   ", cmds[i].name);
-			mput_char(' ', longest > len ? longest - len : 1);
+			if (longest > len)
+				mput_char(' ', longest - len);
 			puts(_(cmds[i].help));
 		}
 	}