find . \( -name '*.h' -o -name '*.c' \) -exec sed -i 'N;/^\n$/D;P;D;' {} \;

find . \( -name '*.h' -o -name '*.c' \) -exec sed -i 's/[[:space:]]*$//' {} \;
find . \( -name '*.h' -o -name '*.c' \) -exec sed -i 's/\t*$//' {} \;

Origin commit :
https://gitlab.gnome.org/GNOME/metacity/commit/c87f73f3b4413720a2f3e6a672826d3fec7f77a9
"
XmbTextPropertyToTextList documentation says that XFreeStringList
should be used to free the storage for the list and its contents.
"

Fixes Clang static analyzer warnings:

core/xprops.c:761:9: warning: Casting a non-structure type to a structure type and accessing a field can lead to memory access errors or data corruption
  raw = (xPropWMHints*) results->prop;
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

core/xprops.c:883:9: warning: Casting a non-structure type to a structure type and accessing a field can lead to memory access errors or data corruption
  raw = (xPropSizeHints*) results->prop;
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fixes Clang static analyzer warnings:

warning: Call to function 'strcpy' is insecure as it does not provide bounding of the memory buffer. Replace unbounded copy functions with analogous functions that support length arguments such as 'strlcpy'. CWE-119

both functions have the same code

When putting 32-bit properties into longs on 64-bit architectures,
XGetWindowProperty assumes the values are supposed to be signed, and
so it sign-extends values greater than 0x7fffffff. So if they *aren't*
supposed to be signed, we need to chop off the high bits ourselves.

(Most CARDINAL-valued properties only end up using small values
anyway, so it doesn't matter, but _NET_WM_WINDOW_OPACITY uses the full
range, and so was previously failing on 64-bit machines.)

https://bugzilla.gnome.org/show_bug.cgi?id=605678

Just run:
 $ find -name '*.c' -print0 | xargs -r0 sed -e 's/[[:blank:]]\+$//' -i
 $ find -name '*.h' -print0 | xargs -r0 sed -e 's/[[:blank:]]\+$//' -i