gallium/aux/tgsi/tgsi_text.c: Fix warnings

In function 'parse_identifier':
tgsi_text.c:190:16: warning: comparison between signed and unsigned
integer expressions [-Wsign-compare]
          if (i == len - 1)
                ^~
tgsi_text.c: In function 'parse_optional_swizzle':
tgsi_text.c:816:21: warning: comparison between signed and unsigned
integer expressions [-Wsign-compare]
       for (i = 0; i < components; i++) {
                     ^
tgsi_text.c: In function 'parse_instruction':
tgsi_text.c:1025:18: warning: comparison between signed and unsigned
integer expressions [-Wsign-compare]
    for (i = 0; i < info->num_dst + info->num_src + info->is_tex; i++) {
                  ^
tgsi_text.c:1040:18: warning: comparison between signed and unsigned
integer expressions [-Wsign-compare]
       else if (i < info->num_dst + info->num_src) {
                  ^
tgsi_text.c: In function 'parse_immediate':
tgsi/tgsi_text.c:1525:24: warning: comparison between signed and
unsigned integer expressions [-Wsign-compare]
    for (type = 0; type < Elements(tgsi_immediate_type_names); ++type) {

Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Signed-off-by: Jakob Bornecrantz <jakob@collabora.com>

src/gallium/auxiliary/tgsi/tgsi_text.c

@@ -219,7 +219,7 @@ static boolean parse_int( const char **pcur, int *val )
 static boolean parse_identifier( const char **pcur, char *ret, size_t len )
 {
    const char *cur = *pcur;
-   int i = 0;
+   size_t i = 0;
    if (is_alpha_underscore( cur )) {
       ret[i++] = *cur++;
       while (is_alpha_underscore( cur ) || is_digit( cur )) {
@@ -853,7 +853,7 @@ parse_optional_swizzle(
 
    eat_opt_white( &cur );
    if (*cur == '.') {
-      uint i;
+      int i;
 
       cur++;
       eat_opt_white( &cur );
@@ -1023,7 +1023,7 @@ parse_instruction(
    struct translate_ctx *ctx,
    boolean has_label )
 {
-   uint i;
+   int i;
    uint saturate = 0;
    uint precise = 0;
    const struct tgsi_opcode_info *info;
@@ -1611,7 +1611,7 @@ static boolean parse_immediate( struct translate_ctx *ctx )
 {
    struct tgsi_full_immediate imm;
    uint advance;
-   int type;
+   uint type;
 
    if (*ctx->cur == '[') {
       uint uindex;