[cairo] memory leak in cairo_stroke

[Benjamin Berg]

Hello,

Valgrind is reporting leaks in cairo when testing some GTK engines. For
example:

==19020== 40,896 bytes in 639 blocks are definitely lost in loss record 3,485 of 3,485
==19020==    at 0xFFBAC70: malloc (vg_replace_malloc.c:149)
==19020==    by 0xFFBAD2C: realloc (vg_replace_malloc.c:306)
==19020==    by 0xF9687A4: _cairo_rectilinear_stroker_line_to (cairo-path-stroke.c:1054)
==19020==    by 0xF967790: _cairo_path_fixed_interpret (cairo-path-fixed.c:575)
==19020==    by 0xF9693E0: _cairo_path_fixed_stroke_to_traps (cairo-path-stroke.c:1283)
==19020==    by 0xF9736E0: _cairo_surface_fallback_stroke (cairo-surface-fallback.c:791)
==19020==    by 0xF970C84: _cairo_surface_stroke (cairo-surface.c:1382)
==19020==    by 0xF961608: _cairo_gstate_stroke (cairo-gstate.c:932)
==19020==    by 0xF958594: cairo_stroke_preserve (cairo.c:1906)
==19020==    by 0xF013994: do_redmond_draw_arrow (redmond_gtk2_misc.c:286)
==19020==    by 0xF0159BC: redmond_draw_arrow (redmond_gtk2_drawing.c:444)
==19020==    by 0xFDC15E0: gtk_paint_arrow (gtkstyle.c:5770)
==19020==    by 0x100029BC: main (torturetest.c:346)

It looks like the problem is that _cairo_path_fixed_stroke_rectilinear
(cairo-path-stroke.c) only calls _cairo_rectilinear_stroker_fini on
success.

Benjamin
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