Fix parantheses on return and sizeof statements.

Used script:
```
import re
import sys

for arg in sys.argv[1:]:
    print(arg)
    with open(arg, 'r') as file:
        content = file.read()
        content = re.sub(r"return\s?\((?!.*\).*\()\s*\n?(.*)\n?\);", r"return \1;", \
            content, flags = re.M)
        content = re.sub(r"sizeof ([^\(][a-zA-Z0-9_\[\]]*)", r"sizeof(\1)",\
            content, flags = re.M)
    with open(arg, 'w') as file:
        file.write(content)

```
Executed with:
` find . -regextype posix-egrep -regex ".*\.([hc]|fmt|function)" | xargs -L1 python script.py`

Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
diff --git a/library/aesni.c b/library/aesni.c
index be226c9..09a9e9a 100644
--- a/library/aesni.c
+++ b/library/aesni.c
@@ -60,7 +60,7 @@
         done = 1;
     }
 
-    return( ( c & what ) != 0 );
+    return ( c & what ) != 0 ;
 }
 
 /*
@@ -131,7 +131,7 @@
          : "memory", "cc", "xmm0", "xmm1" );
 
 
-    return( 0 );
+    return 0 ;
 }
 
 /*
@@ -453,10 +453,10 @@
         case 128: aesni_setkey_enc_128( rk, key ); break;
         case 192: aesni_setkey_enc_192( rk, key ); break;
         case 256: aesni_setkey_enc_256( rk, key ); break;
-        default : return( MBEDTLS_ERR_AES_INVALID_KEY_LENGTH );
+        default : return MBEDTLS_ERR_AES_INVALID_KEY_LENGTH ;
     }
 
-    return( 0 );
+    return 0 ;
 }
 
 #endif /* MBEDTLS_HAVE_X86_64 */