device/oprom/realmode/x86.c: Fix memory leak

Do not allocate memory if the bootsplash was not found.
Found by Cppcheck 1.65. Fixes:
[src/device/oprom/realmode/x86.c:280]: (error) Memory leak: decdata

Change-Id: I8f8160d3d349c0c2b2a3ed84461729e9210153d8
Signed-off-by: Daniele Forsi <dforsi@gmail.com>
Reviewed-on: http://review.coreboot.org/6376
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
diff --git a/src/device/oprom/realmode/x86.c b/src/device/oprom/realmode/x86.c
index e25c536..4338e6e 100644
--- a/src/device/oprom/realmode/x86.c
+++ b/src/device/oprom/realmode/x86.c
@@ -270,7 +270,6 @@
 	vbe_set_mode(&mode_info);
 #if CONFIG_BOOTSPLASH
 	struct jpeg_decdata *decdata;
-	decdata = malloc(sizeof(*decdata));
 	unsigned char *jpeg = cbfs_get_file_content(CBFS_DEFAULT_MEDIA,
 						    "bootsplash.jpg",
 						    CBFS_TYPE_BOOTSPLASH,
@@ -279,6 +278,7 @@
 		printk(BIOS_DEBUG, "VBE: No bootsplash found.\n");
 		return;
 	}
+	decdata = malloc(sizeof(*decdata));
 	int ret = 0;
 	ret = jpeg_decode(jpeg, framebuffer, 1024, 768, 16, decdata);
 #endif