net: bridge: Fix merge error

skb pull was being done twice which was causing a wrong packet
offset being set for packets being sent through the bridge driver.

CRs-Fixed: 2281120
Change-Id: I9a4fc0216a5dc0806266ed75ae64f54190172aaf
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>