hv: fix violations in sha256.c for crypto lib

-remove goto
-remove multiple return
-Modify assignment operator in boolean expression
-Modify/fix code style violations
-fix attempt to change parameters passed by value
-fix value need U suffix
-fix use of mixed arithmetic
-fix assigment in expression
-other fixes

Signed-off-by: Chen Gang G <gang.g.chen@intel.com>

Author: GangSecurity