staging: fsl-mc/dpio: Fix cast truncate warning

Sparse reports the following warning:
drivers/staging/fsl-mc/include/dpaa2-fd.h:421:30:
warning: cast truncates bits from constant value (ffff7fff becomes 7fff)

Fix this by explicitly masking the value with 0xffff.
Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fsl-mc/include/dpaa2-fd.h

@@ -418,8 +418,8 @@ static inline bool dpaa2_sg_is_final(const struct dpaa2_sg_entry *sg)
  */
 static inline void dpaa2_sg_set_final(struct dpaa2_sg_entry *sg, bool final)
 {
-	sg->format_offset &= cpu_to_le16(~(SG_FINAL_FLAG_MASK
-					 << SG_FINAL_FLAG_SHIFT));
+	sg->format_offset &= cpu_to_le16((~(SG_FINAL_FLAG_MASK
+					 << SG_FINAL_FLAG_SHIFT)) & 0xFFFF);
 	sg->format_offset |= cpu_to_le16(final << SG_FINAL_FLAG_SHIFT);
 }