Remove all inlines

Following Zig recommendation not to inline except in specific cases, none of
which I think applies to use.

Also, mimalloc.create can't fail (it used to be possible, but that changed a
while ago), so removed its error return.

Author: karlseguin

src/browser/css/libdom.zig

@@ -140,7 +140,7 @@ const MatcherTest = struct {
 test "Browser.CSS.Libdom: matchFirst" {
     const alloc = std.testing.allocator;
 
-    try parser.init();
+    parser.init();
     defer parser.deinit();
 
     var matcher = MatcherTest.init(alloc);
@@ -285,7 +285,7 @@ test "Browser.CSS.Libdom: matchFirst" {
 test "Browser.CSS.Libdom: matchAll" {
     const alloc = std.testing.allocator;
 
-    try parser.init();
+    parser.init();
     defer parser.deinit();
 
     var matcher = MatcherTest.init(alloc);

src/browser/dump.zig

@@ -226,7 +226,7 @@ fn writeEscapedAttributeValue(writer: anytype, value: []const u8) !void {
 
 const testing = std.testing;
 test "dump.writeHTML" {
-    try parser.init();
+    parser.init();
     defer parser.deinit();
 
     try testWriteHTML(

src/browser/mimalloc.zig

@@ -26,14 +26,9 @@ const c = @cImport({
     @cInclude("mimalloc.h");
 });
 
-const Error = error{
-    HeapNotNull,
-    HeapNull,
-};
-
 var heap: ?*c.mi_heap_t = null;
 
-pub fn create() Error!void {
+pub fn create() void {
     std.debug.assert(heap == null);
     heap = c.mi_heap_new();
     std.debug.assert(heap != null);

src/browser/mime.zig

@@ -55,7 +55,7 @@ pub const Mime = struct {
     };
 
     /// Returns the null-terminated charset value.
-    pub inline fn charsetString(mime: *const Mime) [:0]const u8 {
+    pub fn charsetString(mime: *const Mime) [:0]const u8 {
         return @ptrCast(&mime.charset);
     }