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gs: fix alignment bug in image_render_interpolate()

--- a/sys/src/cmd/gs/src/gxiscale.c

+++ b/sys/src/cmd/gs/src/gxiscale.c

@@ -182,6 +182,7 @@

     stream_cursor_write w;

     byte *out = penum->line;

+

     if (h != 0) {

 	/* Convert the unpacked data to concrete values in */

 	/* the source buffer. */

@@ -203,7 +204,7 @@

 		for (i = 0; i < pss->params.WidthIn; p -= c, q += c, ++i)

 		    memcpy(q, p, c);

 		r.ptr = out - 1;

-		out = q;

+		out += round_up(pss->params.WidthIn * c, align_bitmap_mod);

 	    }

 	} else {

 	    /* Messy case: concretize each sample. */