win32: update inet_pton(3) implementation

Apply musl commit 7e13e5ae (inet_pton: fix uninitialized memory
use for IPv4-mapped IPv6 addresses).

  When a dot is encountered, the loop counter is incremented before
  exiting the loop, but the corresponding ip array element is left
  uninitialized, so the subsequent memmove (if "::" was seen) and the
  loop copying ip to the output buffer will operate on an uninitialized
  uint16_t.

  The uninitialized data never directly influences the control flow and
  is overwritten on successful return by the second half of the parsed
  IPv4 address. But it's better to fix this to avoid unexpected
  transformations by a sufficiently smart compiler and reports from
  UB-detection tools.

Adds 16 bytes.

0 files changed, 0 insertions, 0 deletions