re PR fortran/48926 (gfortran.dg/coarray/image_index_1.f90 -fcoarray=single  -O2  (test for excess errors))

	PR fortran/48926
	* expr.c (gfc_get_corank): Change return value to int.
	* gfortran.h (gfc_get_corank): Update function prototype.

From-SVN: r176088