Fix signed/unsigned comparison warnings.

dlls/setupapi/diskspace.c

diff --git a/dlls/setupapi/diskspace.c b/dlls/setupapi/diskspace.c
index f47137b..72c6928 100644
--- a/dlls/setupapi/diskspace.c
+++ b/dlls/setupapi/diskspace.c
@@ -117,7 +117,7 @@
                         PVOID Reserved1, UINT Reserved2)
 {
     WCHAR driveW[20];
-    int i;
+    unsigned int i;
     LPDISKSPACELIST list = (LPDISKSPACELIST)DiskSpace;
     BOOL rc = FALSE;
     static const WCHAR bkslsh[]= {'\\',0};

dlls/setupapi/parser.c

diff --git a/dlls/setupapi/parser.c b/dlls/setupapi/parser.c
index 8c760f0..9c13f6d 100644
--- a/dlls/setupapi/parser.c
+++ b/dlls/setupapi/parser.c
@@ -178,7 +178,7 @@
 /* find a section by name */
 static int find_section( struct inf_file *file, const WCHAR *name )
 {
-    int i;
+    unsigned int i;
 
     for (i = 0; i < file->nb_sections; i++)
         if (!strcmpiW( name, file->sections[i]->name )) return i;
@@ -313,7 +313,8 @@
     struct section *strings_section;
     struct line *line;
     struct field *field;
-    int i, dirid;
+    unsigned int i;
+    int dirid;
     WCHAR *dirid_str, *end;
     const WCHAR *ret = NULL;
 
@@ -1167,7 +1168,7 @@
 void WINAPI SetupCloseInfFile( HINF hinf )
 {
     struct inf_file *file = hinf;
-    int i;
+    unsigned int i;
 
     for (i = 0; i < file->nb_sections; i++) HeapFree( GetProcessHeap(), 0, file->sections[i] );
     HeapFree( GetProcessHeap(), 0, file->src_root );

dlls/setupapi/queue.c

diff --git a/dlls/setupapi/queue.c b/dlls/setupapi/queue.c
index 38b1115..37c7295 100644
--- a/dlls/setupapi/queue.c
+++ b/dlls/setupapi/queue.c
@@ -173,7 +173,7 @@
  */
 static BOOL build_filepathsW( const struct file_op *op, FILEPATHS_W *paths )
 {
-    int src_len = 1, dst_len = 1;
+    unsigned int src_len = 1, dst_len = 1;
     WCHAR *source = (PWSTR)paths->Source, *target = (PWSTR)paths->Target;
 
     if (op->src_root) src_len += strlenW(op->src_root) + 1;