[PATCH] Do not dereference NULL pointer in resolve_ref (PR fortran/89185).

[Martin Liška]

Hi.

In r268092 there was added a code that guard the loop
in resolve_ref. Unfortunately, one needs to prevent execution
of 'prev = &(*prev)->next' that happens before the loop guard check.

Patch can bootstrap on x86_64-linux-gnu and survives regression tests.

Ready to be installed?
Thanks,
Martin

gcc/fortran/ChangeLog:

2019-02-04  Martin Liska  <mliska@suse.cz>

	PR fortran/89185
	* resolve.c (resolve_ref): Remove breakout variable as
	we need to prevent prev = &(*prev)->next to happen
	with *prev == NULL.
---
 gcc/fortran/resolve.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)


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