loongarch: Fixed {sc/dz}amax LSX opt

kernel/loongarch64/camax_lsx.S

@@ -177,7 +177,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     FABS t4, t4
     ADD t1, t1, t2
     ADD t3, t3, t4
-    FMAX s1, t1, t3
+    FMAX s2, t1, t3
     LD t1, X, 0 * SIZE
     LD t2, X, 1 * SIZE
     add.d X, X, INCX
@@ -205,13 +205,16 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     ADD t1, t1, t2
     ADD t3, t3, t4
     FMAX s4, t1, t3
+
+    FMAX s1, s1, s2
+    FMAX s3, s3, s4
+    FMAX a0, a0, s3
+    FMAX a0, a0, s1
     blt $r0, I, .L21
     .align 3
 
 .L22:
-    FMAX s1, s1, s2
-    FMAX s3, s3, s4
-    FMAX s1, s1, s3
+    MOV s1, a0
     .align 3
 
 .L23: //N<8