Blackfin: fix anomaly 283 handling with exact hardware error

The exact hardware error handling code was added before the workaround
for anomaly 283 which caused the anomaly to be triggered in some cases
(an infinite core stall).  So re-order the code to avoid this.
Reported-by: NAndrew Rook <andrew.rook@speakerbus.co.uk>
Signed-off-by: NRobin Getz <robin.getz@analog.com>
Signed-off-by: NMike Frysinger <vapier@gentoo.org>

arch/blackfin/mach-common/entry.S

@@ -482,6 +482,8 @@ ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
 	[--sp] = ASTAT;
 	[--sp] = (R7:6,P5:4);
 
+	ANOMALY_283_315_WORKAROUND(p5, r7)
+
 #ifdef CONFIG_EXACT_HWERR
 	/* Make sure all pending read/writes complete. This will ensure any
 	 * accesses which could cause hardware errors completes, and signal
@@ -492,8 +494,6 @@ ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
 	ssync;
 #endif
 
-	ANOMALY_283_315_WORKAROUND(p5, r7)
-
 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 	/*
 	 * Save these registers, as they are only valid in exception context