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checkpatch - FAILED

ERROR: do not use assignment in if condition
#375: FILE: net/xfrm/xfrm_iptfs.c:1147:
+			if (!fragwalk ||

total: 1 errors, 0 warnings, 0 checks, 362 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit 50bded348088 ("xfrm: iptfs: add skb-fragment sharing code") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.