Another round of path handling fixesHEADmaster

 * In canonpath():
   * Make sure the internal path_copy buffer is zero initialized, this
     guarantees a trailing \0 when copying the input to the buffer
   * Handle failing getcwd()
   * Copy path argument to the correct offset when converting relative to
     absolute paths
 * In uh_realpath():
   * Fix off-by-one in strncpy() - usually the callers buffer is
     zero-initialized so the trailing \0 is present nonetheless but this
     makes the function safer to use

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

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