radeonsi/gfx9: fix 1D array shader images

Cc: 17.1 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/gallium/drivers/radeonsi/si_shader.c

@@ -3425,6 +3425,7 @@ static LLVMValueRef image_fetch_coords(
 		} else if (target == TGSI_TEXTURE_1D_ARRAY) {
 			coords[2] = coords[1];
 			coords[1] = ctx->i32_0;
+			num_coords++;
 		}
 	}