[gcc r17-2690] Fix m68k bootstrap due to -Wempty-body warning

https://gcc.gnu.org/g:7c19a52852b7bfef10430b90f8f51eedf217663d

commit r17-2690-g7c19a52852b7bfef10430b90f8f51eedf217663d
Author: Jeff Law <[email protected]>
Date:   Fri Jul 24 16:19:57 2026 -0600

    Fix m68k bootstrap due to -Wempty-body warning
    
    Ah the jobs of conditional compilation...
    
    A recent change is breaking m68k bootstrap as it doesn't have any
    UNSPECV_VALUES and as a result we end up with
    
    if (cond)
      ;
    [ With no else clauses. ]
    
    Which triggers:
    
    > /home/jlaw/test/gcc/gcc/print-rtl.cc: In function ‘void print_exp(pretty_printer*, const_rtx, int)’:
    > /home/jlaw/test/gcc/gcc/print-rtl.cc:1622:11: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
    
    Rather than using ";" we can use a "{}" pair with proper formatting as the
    warning suggests.
    
    Committing as obvious and hopefully restoring m68k bootstrap.
    
    gcc/
            * print-rtl.cc (print_exp): Avoid -Wempty-body warning.

Diff:
---
 gcc/print-rtl.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/print-rtl.cc b/gcc/print-rtl.cc
index b969c6d82299..315b027516dc 100644
--- a/gcc/print-rtl.cc
+++ b/gcc/print-rtl.cc
@@ -1619,7 +1619,8 @@ print_exp (pretty_printer *pp, const_rtx x, int verbose)
 	auto unspec = XINT (x, 1);
 #if !defined(GENERATOR_FILE)
 	if (unspec < 0)
-	  ;
+	  {
+	  }
 #if NUM_UNSPECV_VALUES > 0
 	else if (GET_CODE (x) == UNSPEC_VOLATILE
 		 && unspec < NUM_UNSPECV_VALUES)