remoteproc: qcom: Fix error handling paths in order to avoid memory leaks

In case of error returned by 'q6v5_xfer_mem_ownership', we must free
some resources before returning.

In 'q6v5_mpss_init_image()', add a new label to undo a previous
'dma_alloc_attrs()'.
In 'q6v5_mpss_load()', re-use the already existing error handling code to
undo a previous 'request_firmware()', as already done in the other error
handling paths of the function.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

drivers/remoteproc/qcom_q6v5_pil.c

@@ -580,7 +580,8 @@ static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw)
 	if (ret) {
 		dev_err(qproc->dev,
 			"assigning Q6 access to metadata failed: %d\n", ret);
-		return -EAGAIN;
+		ret = -EAGAIN;
+		goto free_dma_attrs;
 	}
 
 	writel(phys, qproc->rmb_base + RMB_PMI_META_DATA_REG);
@@ -599,6 +600,7 @@ static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw)
 		dev_warn(qproc->dev,
 			 "mdt buffer not reclaimed system may become unstable\n");
 
+free_dma_attrs:
 	dma_free_attrs(qproc->dev, fw->size, ptr, phys, dma_attrs);
 
 	return ret < 0 ? ret : 0;
@@ -712,7 +714,8 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
 	if (ret) {
 		dev_err(qproc->dev,
 			"assigning Q6 access to mpss memory failed: %d\n", ret);
-		return -EAGAIN;
+		ret = -EAGAIN;
+		goto release_firmware;
 	}
 
 	boot_addr = relocate ? qproc->mpss_phys : min_addr;