Shut up a coverity warning
Shut up a coverity warning

xf86-input-synaptics-1.8.0/src/synaptics.c:498: var_compare_op: Comparing
"end_str" to null implies that "end_str" might be null.

end_str can't be null, so no need for this check and no need to get Coverity
all confused.

Signed-off-by: Peter Hutterer <b9c50af7afa7642f6f854434cda9ffe54ece8b85@who-t.net>
Reviewed-by: Keith Packard <fd7f967895e9f35e58ec8a62a847a54d7fa7275f@keithp.com>

mad-s/xf86-input-synaptics-absolute,mad-s/xf86-input-synaptics-absolute