video: Rename CONFIG_SYS_VIDEO_LOGO_MAX_SIZE

This option should not have the SYS_ in it. Drop it so it fits in with the
other video options.

Also simplify the alignment code in gunzip_bmp(), since malloc() always
returns a 32-bit-aligned pointer.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/bmp.c b/cmd/bmp.c
index d72a826..5a3c8dd 100644
--- a/cmd/bmp.c
+++ b/cmd/bmp.c
@@ -48,27 +48,24 @@
 	/*
 	 * Decompress bmp image
 	 */
-	len = CONFIG_SYS_VIDEO_LOGO_MAX_SIZE;
+	len = CONFIG_VIDEO_LOGO_MAX_SIZE;
 	/* allocate extra 3 bytes for 32-bit-aligned-address + 2 alignment */
-	dst = malloc(CONFIG_SYS_VIDEO_LOGO_MAX_SIZE + 3);
-	if (dst == NULL) {
+	dst = malloc(CONFIG_VIDEO_LOGO_MAX_SIZE + 3);
+	if (!dst) {
 		puts("Error: malloc in gunzip failed!\n");
 		return NULL;
 	}
 
-	bmp = dst;
-
 	/* align to 32-bit-aligned-address + 2 */
-	bmp = (struct bmp_image *)((((uintptr_t)dst + 1) & ~3) + 2);
+	bmp = dst + 2;
 
-	if (gunzip(bmp, CONFIG_SYS_VIDEO_LOGO_MAX_SIZE, map_sysmem(addr, 0),
-		   &len) != 0) {
+	if (gunzip(bmp, CONFIG_VIDEO_LOGO_MAX_SIZE, map_sysmem(addr, 0),
+		   &len)) {
 		free(dst);
 		return NULL;
 	}
-	if (len == CONFIG_SYS_VIDEO_LOGO_MAX_SIZE)
-		puts("Image could be truncated"
-				" (increase CONFIG_SYS_VIDEO_LOGO_MAX_SIZE)!\n");
+	if (len == CONFIG_VIDEO_LOGO_MAX_SIZE)
+		puts("Image could be truncated (increase CONFIG_VIDEO_LOGO_MAX_SIZE)!\n");
 
 	/*
 	 * Check for bmp mark 'BM'