mod_i2c_mem() bugfix

The last used chip, address, and address length were not being
stored for the imm and imn commands.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/common/cmd_i2c.c b/common/cmd_i2c.c
index aac7e9a..91bf25b 100644
--- a/common/cmd_i2c.c
+++ b/common/cmd_i2c.c
@@ -529,9 +529,9 @@
 		}
 	} while (nbytes);
 
-	chip = i2c_mm_last_chip;
-	addr = i2c_mm_last_addr;
-	alen = i2c_mm_last_alen;
+	i2c_mm_last_chip = chip;
+	i2c_mm_last_addr = addr;
+	i2c_mm_last_alen = alen;
 
 	return 0;
 }