socl/examples: fix signed-ness

socl/examples/basic/basic.c

@@ -90,7 +90,7 @@ int main(int UNUSED(argc), char** UNUSED(argv)) {
    err = clGetPlatformIDs(sizeof(platforms)/sizeof(cl_platform_id), platforms, NULL);
    check(err, "clGetPlatformIDs");
 
-   unsigned int platform_idx = -1;
+   int platform_idx = -1;
    for (i=0; i<num_platforms;i++) {
     char vendor[256];
     clGetPlatformInfo(platforms[i], CL_PLATFORM_VENDOR, sizeof(vendor), vendor, NULL);

socl/examples/mansched/mansched.c

@@ -56,7 +56,7 @@ int main(int UNUSED(argc), char** UNUSED(argv)) {
    cl_kernel kernel;
    cl_mem s1m, s2m, dm;
    cl_command_queue cq;
-   int d;
+   unsigned int d;
    cl_int err;
 
    TYPE s1[SIZE],s2[SIZE],dst[SIZE];

socl/examples/testmap/testmap.c

@@ -82,7 +82,7 @@ int main(int UNUSED(argc), char** UNUSED(argv)) {
    err = clGetPlatformIDs(sizeof(platforms)/sizeof(cl_platform_id), platforms, NULL);
    check(err, "clGetPlatformIDs");
 
-   unsigned int platform_idx = -1;
+   int platform_idx = -1;
    for (i=0; i<num_platforms;i++) {
     char vendor[256];
     clGetPlatformInfo(platforms[i], CL_PLATFORM_VENDOR, sizeof(vendor), vendor, NULL);