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/include/mbedtls/x509.h b/include/mbedtls/x509.h
index df187cb..233cc85 100644
--- a/include/mbedtls/x509.h
+++ b/include/mbedtls/x509.h
@@ -354,7 +354,7 @@
 #define MBEDTLS_X509_SAFE_SNPRINTF                          \
     do {                                                    \
         if( ret < 0 || (size_t) ret >= n )                  \
-            return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL );    \
+            return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL ;    \
                                                             \
         n -= (size_t) ret;                                  \
         p += (size_t) ret;                                  \