BUILD: buf: make b_ncat() take a const for the source
In 2.7 with commit 35df34223b
("MINOR: buffers: split b_force_xfer() into
b_cpy() and b_force_xfer()"), b_ncat() was extracted from b_force_xfer()
but kept its source variable instead of constant, making it unusable for
calls from a const source. Let's just fix it.
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@ -619,7 +619,7 @@ static inline size_t b_xfer(struct buffer *dst, struct buffer *src, size_t count
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* b_room(dst).
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* Returns the number of bytes copied.
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*/
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static inline size_t b_ncat(struct buffer *dst, struct buffer *src, size_t count)
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static inline size_t b_ncat(struct buffer *dst, const struct buffer *src, size_t count)
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{
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size_t ret, block1, block2;
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