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/tests/suites/host_test.function b/tests/suites/host_test.function
index a5fd717..f414c38 100644
--- a/tests/suites/host_test.function
+++ b/tests/suites/host_test.function
@@ -15,13 +15,13 @@
     {
         mbedtls_fprintf( stderr,
             "Expected string (with \"\") for parameter and got: %s\n", *str );
-        return( -1 );
+        return -1 ;
     }
 
     ( *str )++;
     ( *str )[strlen( *str ) - 1] = '\0';
 
-    return( 0 );
+    return 0 ;
 }
 
 /**
@@ -71,12 +71,12 @@
         else
             *value = strtol( str, NULL, 10 );
 
-        return( 0 );
+        return 0 ;
     }
 
     mbedtls_fprintf( stderr,
                     "Expected integer for parameter and got: %s\n", str );
-    return( KEY_VALUE_MAPPING_NOT_FOUND );
+    return KEY_VALUE_MAPPING_NOT_FOUND ;
 }
 
 
@@ -117,7 +117,7 @@
     {
         ret = fgets( buf, len, f );
         if( ret == NULL )
-            return( -1 );
+            return -1 ;
 
         str_len = strlen( buf );
 
@@ -144,7 +144,7 @@
     if( ret-- > buf && *ret == '\r' )
         *ret = '\0';
 
-    return( 0 );
+    return 0 ;
 }
 
 /**
@@ -217,7 +217,7 @@
         *q = '\0';
     }
 
-    return( cnt );
+    return cnt ;
 }
 
 /**
@@ -312,7 +312,7 @@
           break;
         }
     }
-    return( ret );
+    return ret ;
 }
 
 /**
@@ -342,7 +342,7 @@
     const char ref[10] = "xxxxxxxxx";
 
     if( n >= sizeof( buf ) )
-        return( -1 );
+        return -1 ;
     ret = mbedtls_snprintf( buf, n, "%s", "123" );
     if( ret < 0 || (size_t) ret >= n )
         ret = -1;
@@ -351,10 +351,10 @@
         ref_ret != ret ||
         memcmp( buf + n, ref + n, sizeof( buf ) - n ) != 0 )
     {
-        return( 1 );
+        return 1 ;
     }
 
-    return( 0 );
+    return 0 ;
 }
 
 /**
@@ -547,7 +547,7 @@
     if( pointer != NULL )
     {
         mbedtls_fprintf( stderr, "all-bits-zero is not a NULL pointer\n" );
-        return( 1 );
+        return 1 ;
     }
 
     /*
@@ -556,7 +556,7 @@
     if( run_test_snprintf() != 0 )
     {
         mbedtls_fprintf( stderr, "the snprintf implementation is broken\n" );
-        return( 1 );
+        return 1 ;
     }
 
     if( outcome_file_name != NULL && *outcome_file_name != '\0' )
@@ -623,7 +623,7 @@
                              test_filename );
             if( outcome_file != NULL )
                 fclose( outcome_file );
-            return( 1 );
+            return 1 ;
         }
 
         while( !feof( file ) )
@@ -819,5 +819,5 @@
     mbedtls_memory_buffer_alloc_free();
 #endif
 
-    return( total_errors != 0 );
+    return total_errors != 0 ;
 }