The attached patch fixes an out of bound write to memory allocated
with alloca() on the stack.  This rarely ever happened because on
one hand -fbounds-check needs to be enabled, and on the other hand
alloca() used to allocate a few bytes extra most of the time so
most of the time the excess write did no harm.

gcc/fortran/ChangeLog:

	* trans-array.c (gfc_conv_array_ref): Fix allocation of diagnostic
	message (was too small).

From-SVN: r238849