[cairo] typo in head

[Shunichi Fuji]

hi, build error here due to typo in cairo-glitz-surfice.c.
i attached a patch.

----
> libtool: compile:  i686-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I.. -I. -I/usr/inc
> lude/pixman-1 -I/usr/include/freetype2 -D_REENTRANT -I/usr/include/directfb -I/u
> sr/include/libpng12 -Wall -Wextra -Wsign-compare -Werror-implicit-function-decla
> ration -Wpointer-arith -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes 
> -Wmissing-declarations -Wnested-externs -Wpacked -Wswitch-enum -Wmissing-format-
> attribute -Wstrict-aliasing=2 -Winit-self -Wunsafe-loop-optimizations -Wdeclarat
> ion-after-statement -Wold-style-definition -Wno-missing-field-initializers -Wno-
> unused-parameter -Wno-attributes -Wno-long-long -Winline -fno-strict-aliasing -W
> p,-D_FORTIFY_SOURCE=2 -O2 -march=athlon-xp -pipe -finline-limit=1200 -MT cairo-g
> litz-surface.lo -MD -MP -MF .deps/cairo-glitz-surface.Tpo -c cairo-glitz-surface
> .c  -fPIC -DPIC -o .libs/cairo-glitz-surface.o
> cairo-glitz-surface.c: In function '_cairo_glitz_surface_get_image':
> cairo-glitz-surface.c:210: warning: comparison between signed and unsigned
> cairo-glitz-surface.c:212: warning: comparison between signed and unsigned
> cairo-glitz-surface.c: In function '_cairo_glitz_surface_old_show_glyphs':
> cairo-glitz-surface.c:2265: error: expected expression before 'cairo_surface_t'
> cairo-glitz-surface.c:2265: error: called object 'clone_offset_y' is not a functi
> on
> cairo-glitz-surface.c:2266: error: too few arguments to function '_cairo_glitz_su
> rface_clone_similar'
> make[3]: *** [cairo-glitz-surface.lo] Error 1
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