Fix scanf edge case with '-' character in last position and '%d' conversion (bug #63383) * oct-stream.cc (octave_scan_1): Use "is >> std::ws" at start of function to strip whitespace from start of field. Record pointer position in new variable pos. Remove hand-coded whitespace stripping code from '%i' case in switch statement. After reading value, if an error is found then re-position stream pointer with seekg() and pass error on.

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