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-rw-r--r--xdiff-interface.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/xdiff-interface.c b/xdiff-interface.c
index 98b02eda3..9ee877c6f 100644
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -121,7 +121,7 @@ static void trim_common_tail(mmfile_t *a, mmfile_t *b, long ctx)
bp -= blk;
}
- while (recovered < trimmed && ctx)
+ while (recovered < trimmed && 0 <= ctx)
if (ap[recovered++] == '\n')
ctx--;
a->size -= (trimmed - recovered);