staging: prima: Fix for loop has empty body

Silence this warnings:

../drivers/staging/prima/CORE/HDD/src/wlan_hdd_cfg.c:4096:43: error: for loop has empty body [-Werror,-Wempty-body]
   for (ptr = str; i_isspace(*ptr); ptr++);
                                          ^
../drivers/staging/prima/CORE/HDD/src/wlan_hdd_cfg.c:4096:43: note: put the semicolon on a separate line to silence this warning
../drivers/staging/prima/CORE/HDD/src/wlan_hdd_cfg.c:4105:48: error: for loop has empty body [-Werror,-Wempty-body]
   for (; ptr != str && i_isspace(*ptr); ptr--);
                                               ^
../drivers/staging/prima/CORE/HDD/src/wlan_hdd_cfg.c:4105:48: note: put the semicolon on a separate line to silence this warning

Signed-off-by: khusika <khusikadhamar@gmail.com>
Change-Id: I91d8f79da90ca60f86f27fb7e5c5aecd2b7290d0