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/version.c b/library/version.c
index 32a0d7d..d80de43 100644
--- a/library/version.c
+++ b/library/version.c
@@ -26,7 +26,7 @@
 
 unsigned int mbedtls_version_get_number( void )
 {
-    return( MBEDTLS_VERSION_NUMBER );
+    return MBEDTLS_VERSION_NUMBER ;
 }
 
 void mbedtls_version_get_string( char *string )