Debugger: Fix some broken comparisons.

* Missing parentheses in integer comparison inversion
 * !=, not ! at the beginning of expression

Spotted by Clang.

src/kits/debugger/elf/ElfFile.cpp

@@ -224,7 +224,7 @@ ElfFile::Init(const char* fileName)
 		return bytesRead < 0 ? errno : B_ERROR;
 
 	// magic
-	if (!memcmp(elfIdent, ELFMAG, 4) == 0)
+	if (!(memcmp(elfIdent, ELFMAG, 4) == 0))
 		return B_ERROR;
 
 	// endianess

src/kits/debugger/ids/FunctionID.cpp

@@ -63,7 +63,7 @@ FunctionID::ComputeHashValue() const
 bool
 FunctionID::IsValid() const
 {
-	return !fPath.Length() == 0 && !fFunctionName.Length() == 0;
+	return fPath.Length() != 0 && fFunctionName.Length() != 0;
 }