soc: fsl: qe: drop use of IS_ERR_VALUE in qe_sdma_init()

Now that qe_muram_alloc() returns s32, adapt qe_sdma_init() and avoid
another few IS_ERR_VALUE() uses.
Reviewed-by: Timur Tabi <timur@kernel.org>
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Li Yang <leoyang.li@nxp.com>

drivers/soc/fsl/qe/qe.c

@@ -365,16 +365,16 @@ EXPORT_SYMBOL(qe_put_snum);
 static int qe_sdma_init(void)
 {
 	struct sdma __iomem *sdma = &qe_immr->sdma;
-	static unsigned long sdma_buf_offset = (unsigned long)-ENOMEM;
+	static s32 sdma_buf_offset = -ENOMEM;
 
 	if (!sdma)
 		return -ENODEV;
 
 	/* allocate 2 internal temporary buffers (512 bytes size each) for
 	 * the SDMA */
-	if (IS_ERR_VALUE(sdma_buf_offset)) {
+	if (sdma_buf_offset < 0) {
 		sdma_buf_offset = qe_muram_alloc(512 * 2, 4096);
-		if (IS_ERR_VALUE(sdma_buf_offset))
+		if (sdma_buf_offset < 0)
 			return -ENOMEM;
 	}