Check the that the hash length is shorter than the message length. This
avoids:
    ./tools/../lib/rsa/rsa-verify.c:275:11: warning:
    ‘*db’ may be used uninitialized [-Wmaybe-uninitialized]
      275 |         db[0] &= 0xff >> leftmost_bits;
Fixes: 
						
					
				
			 | 
			||
|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| rsa-keyprop.c | ||
| rsa-mod-exp.c | ||
| rsa-sign.c | ||
| rsa-verify.c | ||