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/util/strerror.c b/programs/util/strerror.c
index 4b776d3..dda6916 100644
--- a/programs/util/strerror.c
+++ b/programs/util/strerror.c
@@ -65,7 +65,7 @@
         if( *end != '\0' )
         {
             mbedtls_printf( USAGE );
-            return( 0 );
+            return 0 ;
         }
     }
     if( val > 0 )