cselib: Fix up previous patch for SPARC [PR117239]

Sorry, our CI bot just notified me I broke SPARC build.  There are two
 #ifdef STACK_ADDRESS_OFFSET
guarded snippets and the macro is only defined on SPARC target, so I didn't
notice there was a syntax error.

Fixed thusly.

2025-02-05  Jakub Jelinek  <jakub@redhat.com>

	PR rtl-optimization/117239
	* cselib.cc (cselib_init): Remove spurious closing paren in
	the #ifdef STACK_ADDRESS_OFFSET specific code.