softfloat: Fix warn about implicit conversion from int to int8_t

Change the flag type to 'uint8_t' to fix the implicit conversion error.
Signed-off-by: NPranith Kumar <bobby.prani@gmail.com>
Reviewed-by: NAurelien Jarno <aurelien@aurel32.net>
Message-id: 20160810185502.32015-1-bobby.prani@gmail.com
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

fpu/softfloat-specialize.h

@@ -197,7 +197,7 @@ float128 float128_default_nan(float_status *status)
 | should be simply `float_exception_flags |= flags;'.
 *----------------------------------------------------------------------------*/
 
-void float_raise(int8_t flags, float_status *status)
+void float_raise(uint8_t flags, float_status *status)
 {
     status->float_exception_flags |= flags;
 }

include/fpu/softfloat.h

@@ -198,7 +198,7 @@ enum {
 typedef struct float_status {
     signed char float_detect_tininess;
     signed char float_rounding_mode;
-    signed char float_exception_flags;
+    uint8_t     float_exception_flags;
     signed char floatx80_rounding_precision;
     /* should denormalised results go to zero and set the inexact flag? */
     flag flush_to_zero;
@@ -274,7 +274,7 @@ static inline flag get_default_nan_mode(float_status *status)
 | Routine to raise any or all of the software IEC/IEEE floating-point
 | exception flags.
 *----------------------------------------------------------------------------*/
-void float_raise(int8_t flags, float_status *status);
+void float_raise(uint8_t flags, float_status *status);
 
 /*----------------------------------------------------------------------------
 | If `a' is denormal and we are in flush-to-zero mode then set the