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/md5.c b/library/md5.c
index d7f8cee..9761316 100644
--- a/library/md5.c
+++ b/library/md5.c
@@ -98,7 +98,7 @@
     ctx->state[2] = 0x98BADCFE;
     ctx->state[3] = 0x10325476;
 
-    return( 0 );
+    return 0 ;
 }
 
 #if !defined(MBEDTLS_MD5_PROCESS_ALT)
@@ -234,7 +234,7 @@
     /* Zeroise variables to clear sensitive data from memory. */
     mbedtls_platform_zeroize( &local, sizeof( local ) );
 
-    return( 0 );
+    return 0 ;
 }
 
 #endif /* !MBEDTLS_MD5_PROCESS_ALT */
@@ -251,7 +251,7 @@
     uint32_t left;
 
     if( ilen == 0 )
-        return( 0 );
+        return 0 ;
 
     left = ctx->total[0] & 0x3F;
     fill = 64 - left;
@@ -266,7 +266,7 @@
     {
         memcpy( (void *) (ctx->buffer + left), input, fill );
         if( ( ret = mbedtls_internal_md5_process( ctx, ctx->buffer ) ) != 0 )
-            return( ret );
+            return ret ;
 
         input += fill;
         ilen  -= fill;
@@ -276,7 +276,7 @@
     while( ilen >= 64 )
     {
         if( ( ret = mbedtls_internal_md5_process( ctx, input ) ) != 0 )
-            return( ret );
+            return ret ;
 
         input += 64;
         ilen  -= 64;
@@ -287,7 +287,7 @@
         memcpy( (void *) (ctx->buffer + left), input, ilen );
     }
 
-    return( 0 );
+    return 0 ;
 }
 
 /*
@@ -318,7 +318,7 @@
         memset( ctx->buffer + used, 0, 64 - used );
 
         if( ( ret = mbedtls_internal_md5_process( ctx, ctx->buffer ) ) != 0 )
-            return( ret );
+            return ret ;
 
         memset( ctx->buffer, 0, 56 );
     }
@@ -334,7 +334,7 @@
     PUT_UINT32_LE( high, ctx->buffer, 60 );
 
     if( ( ret = mbedtls_internal_md5_process( ctx, ctx->buffer ) ) != 0 )
-        return( ret );
+        return ret ;
 
     /*
      * Output final state
@@ -344,7 +344,7 @@
     PUT_UINT32_LE( ctx->state[2], output,  8 );
     PUT_UINT32_LE( ctx->state[3], output, 12 );
 
-    return( 0 );
+    return 0 ;
 }
 
 #endif /* !MBEDTLS_MD5_ALT */
@@ -373,7 +373,7 @@
 exit:
     mbedtls_md5_free( &ctx );
 
-    return( ret );
+    return ret ;
 }
 
 #if defined(MBEDTLS_SELF_TEST)
@@ -444,13 +444,13 @@
     if( verbose != 0 )
         mbedtls_printf( "\n" );
 
-    return( 0 );
+    return 0 ;
 
 fail:
     if( verbose != 0 )
         mbedtls_printf( "failed\n" );
 
-    return( ret );
+    return ret ;
 }
 
 #endif /* MBEDTLS_SELF_TEST */