Offsetting a NULL, even by 0, is UB - Commit 803713a6 - STRLCPY/neomutt

Offsetting a NULL, even by 0, is UB
```
See https://reviews.llvm.org/D67122
```
Pietro Cerutti committed with Richard Russon 2 years ago

803713a6

1 parent 3a695d9f

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mutt/buffer.c

		skipped 482 lines
483	483		void mutt_buffer_seek(struct Buffer *buf, size_t offset)
484	484		{
485	485		if (buf)
486		-	buf->dptr = buf->data + offset;
	486	+	{
	487	+	buf->dptr = buf->data ? buf->data + offset : NULL;
	488	+	}
487	489		}
488	490

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test/string/mutt_str_next_word.c

		skipped 53 lines
54	54		struct NextWordTest *t = &word_tests[i];
55	55		TEST_CASE_("%ld, '%s'", i, NONULL(t->str));
56	56		const char *result = mutt_str_next_word(t->str);
57		-	TEST_CHECK(result == (t->str + t->result));
	57	+	TEST_CHECK(result == (t->str ? t->str + t->result : NULL));
58	58		}
59	59		}
60	60		}
		skipped 1 lines

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