Apply suggestions from code review

Delete unused character.

Author: sakamoti

src/stdlib_logger.f90

@@ -309,7 +309,6 @@ subroutine add_log_unit( self, unit, stat )
  character(12) :: specifier
  logical :: question
  integer :: istat
- character(len=80) :: msgtxt
 
  call validate_unit()
  if ( present(stat) ) then
@@ -352,7 +351,7 @@ subroutine validate_unit()
  end if
 
 ! Check that unit is opened
- inquire( unit, opened=question, iostat=istat, iomsg=msgtxt )
+ inquire( unit, opened=question, iostat=istat )
  if(istat /= 0) question = .false.
  if ( .not. question ) then
  if ( present(stat) ) then

src/tests/logger/test_stdlib_logger.f90

@@ -418,7 +418,6 @@ subroutine test_removing_log_units()
 
  logical :: opened
  integer :: istat
- character(len=80) :: msgtxt
 
  print *
  print *, 'running test_removing_log_units'
@@ -464,7 +463,7 @@ subroutine test_removing_log_units()
 
  end if
 
- inquire( unit4, opened=opened, iostat=istat, iomsg=msgtxt )
+ inquire( unit4, opened=opened, iostat=istat )
  if(istat /= 0) opened = .false.
  if ( opened ) then
  error stop 'UNIT4 is opened contrary to expectations.'