libgfortran: Fix file position after ENDFILE statement.

PR libfortran/107031

libgfortran/ChangeLog:

	* io/file_pos.c (st_endfile): Remove call to next_record().

gcc/testsuite/ChangeLog:

	* gfortran.dg/endfile_5.f90: New test.

gcc/testsuite/gfortran.dg/endfile_5.f90

@@ -0,0 +1,30 @@
+! { dg-do run }
+! PR107031 Check that endfile truncates at end of record 5.
+program test_truncate
+    integer :: num_rec, tmp, i, nr, j
+    open(10, file="in.dat", action='readwrite')
+
+    do i=1,10
+      write(10, *) i
+    end do
+
+    rewind (10)
+
+    num_rec = 5
+    i = 1
+    ioerr = 0
+    do while (i <= num_rec .and. ioerr == 0)
+        read(10, *, iostat=ioerr) tmp
+        i = i + 1
+    enddo
+    endfile(10)
+    rewind (10)
+    i = 0
+    ioerr = 0
+    do while (i <= num_rec + 1 .and. ioerr == 0)
+      read(10, *, iostat=ioerr) j
+      i = i + 1
+    end do
+    close(10, status='delete')
+    if (i - 1 /= 5) stop 1
+end program test_truncate

libgfortran/io/file_pos.c

@@ -352,7 +352,6 @@ st_endfile (st_parameter_filepos *fpp)
 	  dtp.common = fpp->common;
 	  memset (&dtp.u.p, 0, sizeof (dtp.u.p));
 	  dtp.u.p.current_unit = u;
-	  next_record (&dtp, 1);
 	}
 
       unit_truncate (u, stell (u->s), &fpp->common);