Prevent memory corruption by fossilcons command 'uname group -user' when user
is the first of exactly two group members.  (Tested.)

Reference: /n/sources/patch/applied/fossilcons-uname
Date: Thu Jun 14 11:28:16 CES 2007
Signed-off-by: miller@hamnavoe.com

--- /sys/src/cmd/fossil/9user.c	Thu Jun 14 11:26:39 2007
+++ /sys/src/cmd/fossil/9user.c	Thu Jun 14 11:26:34 2007
@@ -225,8 +225,6 @@
 			g->group[i] = g->group[i+1];
 			i++;
 		}
-		/*FALLTHROUGH*/
-	case 1:
 		g->group = vtMemRealloc(g->group, (g->ngroup)*sizeof(char*));
 		break;
 	}