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/programs/ssl/ssl_pthread_server.c b/programs/ssl/ssl_pthread_server.c
index a8db4d8..4517309 100644
--- a/programs/ssl/ssl_pthread_server.c
+++ b/programs/ssl/ssl_pthread_server.c
@@ -267,7 +267,7 @@
 
     thread_info->thread_complete = 1;
 
-    return( NULL );
+    return NULL ;
 }
 
 static int thread_create( mbedtls_net_context *client_fd )
@@ -292,7 +292,7 @@
     }
 
     if( i == MAX_NUM_THREADS )
-        return( -1 );
+        return -1 ;
 
     /*
      * Fill thread-info for thread
@@ -304,10 +304,10 @@
     if( ( ret = pthread_create( &threads[i].thread, NULL, handle_ssl_connection,
                                 &threads[i].data ) ) != 0 )
     {
-        return( ret );
+        return ret ;
     }
 
-    return( 0 );
+    return 0 ;
 }
 
 int main( void )