Kernel: Remove validate_read_str() as nothing uses it anymore :^)

Kernel/Process.cpp

@@ -2103,13 +2103,6 @@ bool Process::validate_read_from_kernel(VirtualAddress vaddr, ssize_t size) cons
     return MM.validate_kernel_read(*this, vaddr, size);
 }
 
-bool Process::validate_read_str(const char* str)
-{
-    if (!validate_read(str, 1))
-        return false;
-    return validate_read(str, strlen(str) + 1);
-}
-
 bool Process::validate_read(const void* address, ssize_t size) const
 {
     ASSERT(size >= 0);

Kernel/Process.h

@@ -256,7 +256,6 @@ public:
 
     bool validate_read(const void*, ssize_t) const;
     bool validate_write(void*, ssize_t) const;
-    bool validate_read_str(const char* str);
     template<typename T>
     bool validate_read_typed(T* value, size_t count = 1) { return validate_read(value, sizeof(T) * count); }
     template<typename T>