srmetadata: remove unused variable

Signed-off-by: Anthoine Bourgeois <anthoine.bourgeois@vates.tech>

Author: AnthoineB

libs/sm/srmetadata.py

@@ -634,7 +634,6 @@ def getMetadataToWrite(self, sr_info, vdi_info, lower, upper, update_map, \
         util.SMlog("Entering getMetadataToWrite")
         try:
             value = b""
-            vdi_map = {}
 
             # if lower is less than SR info
             if lower < SECTOR_SIZE * SR_INFO_SIZE_IN_SECTORS: