Allow negative INCX (API change from version 3.10 of the reference implementation)

kernel/loongarch64/cnrm2.S

@@ -61,7 +61,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    fmov.d s2, s1
    bge $r0,    N, .L999
    slli.d INCX, INCX, ZBASE_SHIFT
-   bge $r0,    INCX, .L999
+   beq $r0,    INCX, .L999
    srai.d  I, N, 2
    bge $r0,    I, .L25
    LD a1,  X,   0 * SIZE

kernel/loongarch64/dnrm2.S

@@ -70,7 +70,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    MTC  s1, $r0
    bge $r0,    N, .L999
    slli.d INCX, INCX, BASE_SHIFT
-   bge $r0,    INCX, .L999
+   beq $r0,    INCX, .L999
    move    XX, X
    NOP
    LD a1,  X,   0 * SIZE

kernel/loongarch64/snrm2.S

@@ -61,7 +61,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    fmov.d s2, s1
    bge $r0,    N, .L999
    slli.d INCX, INCX, BASE_SHIFT
-   bge $r0,    INCX, .L999
+   beq $r0,    INCX, .L999
    srai.d I, N, 3
    bne INCX, TEMP, .L20
    bge $r0,    I, .L15

kernel/loongarch64/znrm2.S

@@ -64,7 +64,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    MTC  s1, $r0
    bge $r0,    N, .L999
    slli.d INCX, INCX, ZBASE_SHIFT
-   bge $r0,    INCX, .L999
+   beq $r0,    INCX, .L999
    move    XX, X
    MOV s2, s1
    srai.d  I, N, 2