crypto: marvell/cesa - change FPGA indirect article to an

Change use of 'a fpga' to 'an fpga'
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/marvell/cesa/cesa.h

@@ -66,7 +66,7 @@
 #define CESA_SA_ST_ACT_1			BIT(1)
 
 /*
- * CESA_SA_FPGA_INT_STATUS looks like a FPGA leftover and is documented only
+ * CESA_SA_FPGA_INT_STATUS looks like an FPGA leftover and is documented only
  * in Errata 4.12. It looks like that it was part of an IRQ-controller in FPGA
  * and someone forgot to remove  it while switching to the core and moving to
  * CESA_SA_INT_STATUS.