sparc: Fix asm/signal.h for 32-bit.

Fix a 32-bit sparc regression reported by Robert Reif.

_NSIG_BPW needs to be 32 for 32-bit and 64 for 64-bit
Tested-by: Robert Reif <reif@earthlink.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/include/asm/signal.h

@@ -84,7 +84,11 @@
 
 #define __OLD_NSIG	32
 #define __NEW_NSIG      64
+#ifdef __arch64__
 #define _NSIG_BPW       64
+#else
+#define _NSIG_BPW       32
+#endif
 #define _NSIG_WORDS     (__NEW_NSIG / _NSIG_BPW)
 
 #define SIGRTMIN       32