MIPS: math-emu: Replace DP_MBITS with DP_FBITS and SP_MBITS with SP_FBITS.

Both were defined as 23 rsp. 52 though the mentissa is actually a bit more
than the fraction.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/math-emu/dp_sub.c b/arch/mips/math-emu/dp_sub.c
index e369c7b..25d25bc 100644
--- a/arch/mips/math-emu/dp_sub.c
+++ b/arch/mips/math-emu/dp_sub.c
@@ -158,7 +158,7 @@
 		xe = xe;
 		xs = xs;
 
-		if (xm >> (DP_MBITS + 1 + 3)) { /* carry out */
+		if (xm >> (DP_FBITS + 1 + 3)) { /* carry out */
 			xm = XDPSRS1(xm);	/* shift preserving sticky */
 			xe++;
 		}
@@ -181,7 +181,7 @@
 
 		/* normalize to rounding precision
 		 */
-		while ((xm >> (DP_MBITS + 3)) == 0) {
+		while ((xm >> (DP_FBITS + 3)) == 0) {
 			xm <<= 1;
 			xe--;
 		}